# SOURCES.md — maps (block plan / sightlines / environment)
Format: file | URL | fetched (UTC) | note
gcf_images/view-item-665.html | https://greatchicagofire.org/view-item/665/ | 2026-09-14T05:57:57Z | item page
gcf_images/view-item-255.html | https://greatchicagofire.org/view-item/255/ | 2026-09-14T05:57:59Z | item page
gcf_images/view-item-269.html | https://greatchicagofire.org/view-item/269/ | 2026-09-14T05:58:00Z | item page
gcf_images/view-item-669.html | https://greatchicagofire.org/view-item/669/ | 2026-09-14T05:58:02Z | item page
sanborn/loc_sanborn_chicago_search.json | https://www.loc.gov/collections/sanborn-maps/?q=chicago+illinois&fo=json&c=100 | 2026-09-14T05:58:05Z | loc search
parcels/nominatim_558_dekoven.json | https://nominatim.openstreetmap.org/search?q=558+W+DeKoven+St,+Chicago,+IL&format=jsonv2 | 2026-09-14T05:58:07Z | geocode
sanborn/item_sanborn01790_001.json | https://www.loc.gov/item/sanborn01790_001/?fo=json | 2026-09-14T05:59:54Z | loc item json
sanborn/item_sanborn01790_007.json | https://www.loc.gov/item/sanborn01790_007/?fo=json | 2026-09-14T05:59:56Z | loc item json
sanborn/item_sanborn01790_006.json | https://www.loc.gov/item/sanborn01790_006/?fo=json | 2026-09-14T05:59:58Z | loc item json
sanborn/item_sanborn01790_006.5.json | https://www.loc.gov/item/sanborn01790_006.5/?fo=json | 2026-09-14T06:00:00Z | loc item json
sanborn/item_sanborn01790_009.json | https://www.loc.gov/item/sanborn01790_009/?fo=json | 2026-09-14T06:00:02Z | loc item json
sanborn/item_sanborn01790_002.json | https://www.loc.gov/item/sanborn01790_002/?fo=json | 2026-09-14T06:00:04Z | loc item json
sanborn/item_sanborn01790_003.json | https://www.loc.gov/item/sanborn01790_003/?fo=json | 2026-09-14T06:00:25Z | loc item json
sanborn/item_sanborn01790_004.json | https://www.loc.gov/item/sanborn01790_004/?fo=json | 2026-09-14T06:00:27Z | loc item json
sanborn/item_sanborn01790_008.json | https://www.loc.gov/item/sanborn01790_008/?fo=json | 2026-09-14T06:00:29Z | loc item json
sanborn/item_sanborn01790_010.json | https://www.loc.gov/item/sanborn01790_010/?fo=json | 2026-09-14T06:00:50Z | loc item json
sanborn/item_sanborn01790_011.json | https://www.loc.gov/item/sanborn01790_011/?fo=json | 2026-09-14T06:00:53Z | loc item json
sanborn/item_sanborn01790_012.json | https://www.loc.gov/item/sanborn01790_012/?fo=json | 2026-09-14T06:00:55Z | loc item json
astronomy/vandendool_1871fires.pdf | https://www.cpc.ncep.noaa.gov/products/people/wd51hd/vddoolpubs/other/other_1871Fires_VandenDool.pdf | 2026-09-14T06:00:57Z | van den Dool, Weather and the Fires of 1871
astronomy/aos_wisc_oct1871fires.htm | https://www.aos.wisc.edu/~hopkins/Weather_History/oct1871fires.htm | 2026-09-14T06:00:57Z | Hopkins weather almanac
texts/greatconflagrati0000shea_djvu.txt | https://archive.org/download/greatconflagrati0000shea/greatconflagrati0000shea_djvu.txt | 2026-09-14T06:01:06Z | full text
texts/chicagogreatconf1871colb_djvu.txt | https://archive.org/download/chicagogreatconf1871colb/chicagogreatconf1871colb_djvu.txt | 2026-09-14T06:01:10Z | full text
texts/historyofchicago02andr_djvu.txt | https://archive.org/download/historyofchicago02andr/historyofchicago02andr_djvu.txt | 2026-09-14T06:01:13Z | full text
texts/historyofgreatfi01good_djvu.txt | https://archive.org/download/historyofgreatfi01good/historyofgreatfi01good_djvu.txt | 2026-09-14T06:01:17Z | full text
gcf_images/oleary-legend-library.html | https://greatchicagofire.org/oleary-legend/oleary-legend-library/ | 2026-09-14T06:01:27Z | gallery listing
directories/chicagocensusrep01edwa_djvu.txt | https://archive.org/download/chicagocensusrep01edwa/chicagocensusrep01edwa_djvu.txt | 2026-09-14T06:03:47Z | Edwards 1871 census report & directory full text
parcels/overpass_block.json | https://overpass-api.de/api/interpreter (query in overpass_query.txt) | 2026-09-14T06:04:13Z | OSM streets+buildings around 558 W DeKoven
sanborn/v09_1894_sheet0.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-ind/full/pct:25/0/default.jpg | 2026-09-14T06:05:55Z | index/title sheet 25%
sanborn/v09_1894_sheet1.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0000/full/pct:25/0/default.jpg | 2026-09-14T06:05:57Z | index/title sheet 25%
sanborn/v09_1894_sheet2.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189409:01790_09_1894-0001/full/pct:25/0/default.jpg | 2026-09-14T06:06:08Z | index/title sheet 25%
sanborn/v10_1896_sheet0.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189610:01790_10_1896-ind/full/pct:25/0/default.jpg | 2026-09-14T06:06:11Z | index/title sheet 25%
sanborn/v10_1896_sheet1.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189610:01790_10_1896-0000/full/pct:25/0/default.jpg | 2026-09-14T06:06:13Z | index/title sheet 25%
sanborn/v10_1896_sheet2.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189610:01790_10_1896-0001/full/pct:25/0/default.jpg | 2026-09-14T06:06:16Z | index/title sheet 25%
sanborn/v11_1896_sheet0.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189611:01790_11_1896-ind1/full/pct:25/0/default.jpg | 2026-09-14T06:06:19Z | index/title sheet 25%
sanborn/v11_1896_sheet1.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189611:01790_11_1896-0000/full/pct:25/0/default.jpg | 2026-09-14T06:06:23Z | index/title sheet 25%
sanborn/v11_1896_sheet2.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189611:01790_11_1896-0001/full/pct:25/0/default.jpg | 2026-09-14T06:06:25Z | index/title sheet 25%
sanborn/v12_1896_sheet0.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189612:01790_12_1896-ind1/full/pct:25/0/default.jpg | 2026-09-14T06:06:28Z | index/title sheet 25%
sanborn/v12_1896_sheet1.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189612:01790_12_1896-0000/full/pct:25/0/default.jpg | 2026-09-14T06:06:32Z | index/title sheet 25%
sanborn/v12_1896_sheet2.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189612:01790_12_1896-0001/full/pct:25/0/default.jpg | 2026-09-14T06:06:34Z | index/title sheet 25%
sanborn/v15_1895_sheet0.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189515:01790_15_1895-ind1/full/pct:25/0/default.jpg | 2026-09-14T06:06:44Z | index/title sheet 25%
sanborn/v15_1895_sheet1.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189515:01790_15_1895-0000/full/pct:25/0/default.jpg | 2026-09-14T06:06:49Z | index/title sheet 25%
sanborn/v15_1895_sheet2.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189515:01790_15_1895-0001/full/pct:25/0/default.jpg | 2026-09-14T06:06:52Z | index/title sheet 25%
sanborn/v16_1895_sheet0.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189516:01790_16_1895-ind/full/pct:25/0/default.jpg | 2026-09-14T06:06:55Z | index/title sheet 25%
sanborn/v16_1895_sheet1.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790189516:01790_16_1895-note/full/pct:25/0/default.jpg | 2026-09-14T06:07:00Z | index/title sheet 25%
texts/papersinillinois1940illi_djvu.txt | https://archive.org/download/papersinillinois1940illi/papersinillinois1940illi_djvu.txt | 2026-09-14T06:07:27Z | Papers in Illinois History 1940 (Musham) full text
texts/nws_lot_1871fire.html | https://www.weather.gov/lot/1871fire | 2026-09-14T06:07:29Z | NWS Chicago 150th anniversary page
texts/chicago_landmark_site_of_fire.pdf | https://www.chicago.gov/content/dam/city/depts/zlup/Historic_Preservation/Publications/Site_of_Chicago_Fire.pdf | 2026-09-14T06:07:31Z | Chicago Landmarks brochure
texts/gcf_landmarks_oleary_home.html | https://greatchicagofire.org/landmarks/oleary-home/ | 2026-09-14T06:07:32Z | GCF landmark page
atlases/nu_greeley_carlson_v1_work.json | https://api.dc.library.northwestern.edu/api/v2/works/bb118ea9-6fbc-4fe5-a335-f68710ed5c8f | 2026-09-14T06:07:33Z | Northwestern DC work record
atlases/nu_greeley_carlson_v1_manifest.json | https://api.dc.library.northwestern.edu/api/v2/works/bb118ea9-6fbc-4fe5-a335-f68710ed5c8f?as=iiif | 2026-09-14T06:09:20Z | IIIF manifest
directories/edwardsannualdir141871chic_djvu.txt | https://archive.org/download/edwardsannualdir141871chic/edwardsannualdir141871chic_djvu.txt | 2026-09-14T06:10:31Z | Edwards directory full text
directories/edwardsannualdir12186970chic_djvu.txt | https://archive.org/download/edwardsannualdir12186970chic/edwardsannualdir12186970chic_djvu.txt | 2026-09-14T06:10:36Z | Edwards directory full text
atlases/nu_v1_index_map_2500.jpg | https://iiif.dc.library.northwestern.edu/iiif/3/c141e2dc-2dfe-4ec3-b6f6-6be37eececeb/full/2500,/0/default.jpg | 2026-09-14T06:12:03Z | Greeley-Carlson 2nd atlas vol.1 index map
parcels/cook_parcels_2021_block.geojson | https://datacatalog.cookcountyil.gov/resource/77tz-riq7.geojson?$where=within_box(the_geom,41.8708,-87.6445,41.8680,-87.6390) | 2026-09-14T06:12:16Z | Cook County GIS parcel polygons 2021
astronomy/nws_10081871_weathermap.png | https://www.weather.gov/images/lot/pastevents/1871/10081871_weathermap.png | 2026-09-14T06:12:43Z | NWS Chicago: Signal Service map / digitized analysis
astronomy/nws_10091871_weathermap.png | https://www.weather.gov/images/lot/pastevents/1871/10091871_weathermap.png | 2026-09-14T06:12:44Z | NWS Chicago: Signal Service map / digitized analysis
astronomy/nws_10101871_weathermap.png | https://www.weather.gov/images/lot/pastevents/1871/10101871_weathermap.png | 2026-09-14T06:12:46Z | NWS Chicago: Signal Service map / digitized analysis
astronomy/nws_Weather_Conditions_1871_10_08_1400.png | https://www.weather.gov/images/lot/pastevents/1871/Weather_Conditions_1871_10_08_1400%20(1).png | 2026-09-14T06:12:47Z | NWS Chicago: Signal Service map / digitized analysis
astronomy/nws_Weather_Conditions_1871_10_09_1400.png | https://www.weather.gov/images/lot/pastevents/1871/Weather_Conditions_1871_10_09_1400.png | 2026-09-14T06:12:49Z | NWS Chicago: Signal Service map / digitized analysis
astronomy/nws_Weather_Conditions_1871_10_10_0700.png | https://www.weather.gov/images/lot/pastevents/1871/Weather_Conditions_1871_10_10_0700.png | 2026-09-14T06:12:50Z | NWS Chicago: Signal Service map / digitized analysis
texts/gcf_landmarks_saturday_night_fire.html | https://greatchicagofire.org/landmarks/saturday-night-fire/ | 2026-09-14T06:15:02Z | GCF landmark page
texts/papersinillinois1940illi.pdf | https://archive.org/download/papersinillinois1940illi/papersinillinois1940illi.pdf | 2026-09-14T06:15:02Z | Papers in Illinois History 1940 PDF (Musham, with plates)
atlases/nu_v1_section28_3000.jpg | https://iiif.dc.library.northwestern.edu/iiif/3/a4b4983f-aea1-42f0-882c-5cf13951a0aa/full/3000,/0/default.jpg | 2026-09-14T06:15:49Z | Greeley-Carlson 2nd atlas vol.1 plate 28 (3000px)
atlases/nu_v1_section27_3000.jpg | https://iiif.dc.library.northwestern.edu/iiif/3/b23ebc34-7e45-425a-8026-135d23c75376/full/3000,/0/default.jpg | 2026-09-14T06:15:55Z | Greeley-Carlson 2nd atlas vol.1 plate 27 (3000px)
sanborn/v02_1910_ind.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790191002:01790_02_1910-ind/full/pct:25/0/default.jpg | 2026-09-14T06:16:34Z | index sheet 25%
sanborn/v03_1911_ind1.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790191103:01790_03_1911-ind1/full/pct:25/0/default.jpg | 2026-09-14T06:16:38Z | index sheet 25%
sanborn/v04_1912_ind1.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790191204:01790_04_1912-ind1/full/pct:25/0/default.jpg | 2026-09-14T06:16:41Z | index sheet 25%
sanborn/v05_1914_ind1.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790191405:01790_05_1914-ind1/full/pct:25/0/default.jpg | 2026-09-14T06:16:45Z | index sheet 25%
atlases/nu_v1_plate28_block38_37_fullres.jpg | https://iiif.dc.library.northwestern.edu/iiif/3/a4b4983f-aea1-42f0-882c-5cf13951a0aa/150,7600,2000,2700/max/0/default.jpg | 2026-09-14T06:18:04Z | full-res crop: blocks 38 & 37 (DeKoven, Jefferson-Clinton)
atlases/nu_v1_plate27_ordinance_table_fullres.jpg | https://iiif.dc.library.northwestern.edu/iiif/3/b23ebc34-7e45-425a-8026-135d23c75376/8400,11500,1890,1200/max/0/default.jpg | 2026-09-14T06:18:06Z | plate 27 street/alley ordinance table
atlases/nu_v1_plate28_margin_notes_fullres.jpg | https://iiif.dc.library.northwestern.edu/iiif/3/a4b4983f-aea1-42f0-882c-5cf13951a0aa/7600,900,1700,6900/max/0/default.jpg | 2026-09-14T06:18:08Z | plate 28 subdivision notes
atlases/nu_v1_index_street_numbers_5000.jpg | https://iiif.dc.library.northwestern.edu/iiif/3/bfda5d57-352b-4305-ae8f-90b800f1afba/full/5000,/0/default.jpg | 2026-09-14T06:18:12Z | Index to street numbers / street ordinances
atlases/nu_v1_section28_fullres.jpg | https://iiif.dc.library.northwestern.edu/iiif/3/a4b4983f-aea1-42f0-882c-5cf13951a0aa/full/max/0/default.jpg | 2026-09-14T06:18:12Z | plate 28 full resolution (archival)
sanborn/v01NW_1906_ind1.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790190601N:01790_01N_1906-ind1/full/pct:25/0/default.jpg | 2026-09-14T06:19:41Z | index sheet 25%
gcf_images/oleary_cottage_1871_abbott_stereograph_ichi-02741.jpg | https://greatchicagofire.org/tiles/02741/ (tiles layer stitched; item page https://greatchicagofire.org/view-item/) | 2026-09-14T06:23:05Z | full-res stitched from tile pyramid
gcf_images/cause_of_the_great_chicago_fire_kellogg_bulkeley_ichi-34703.jpg | https://greatchicagofire.org/tiles/34703/ (tiles layer stitched; item page https://greatchicagofire.org/view-item/) | 2026-09-14T06:23:05Z | full-res stitched from tile pyramid
gcf_images/lamp_found_in_olearys_barn_andreas_ichi-51076.jpg | https://greatchicagofire.org/tiles/51076/ (tiles layer stitched; item page https://greatchicagofire.org/view-item/) | 2026-09-14T06:23:05Z | full-res stitched from tile pyramid
gcf_images/origin_of_the_great_chicago_fire_crosby_1871_ichi-02945.jpg | https://greatchicagofire.org/tiles/02945/ (tiles layer stitched; item page https://greatchicagofire.org/view-item/) | 2026-09-14T06:23:05Z | full-res stitched from tile pyramid
atlases/nu_v1_plate27_inset_dekoven_survey_1875.jpg | https://iiif.dc.library.northwestern.edu/iiif/3/b23ebc34-7e45-425a-8026-135d23c75376/600,2400,2100,1150/max/0/default.jpg | 2026-09-14T06:28:39Z | plate 27 margin: 1875 DeKoven/Bunker location survey plat + notes
atlases/nu_v1_plate27_inset_school_section_plat.jpg | https://iiif.dc.library.northwestern.edu/iiif/3/b23ebc34-7e45-425a-8026-135d23c75376/150,10900,4400,1750/max/0/default.jpg | 2026-09-14T06:28:42Z | plate 27 margin: School Section Addition block plat
atlases/nu_v1_plate27_notes_A.jpg | https://iiif.dc.library.northwestern.edu/iiif/3/b23ebc34-7e45-425a-8026-135d23c75376/850,900,3900,1600/max/0/default.jpg | 2026-09-14T06:28:47Z | plate 27 margin notes A-K
sanborn/v01NW_1906_sheet110_pct25.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790190601N:01790_01N_1906-0110/full/pct:25/0/default.jpg | 2026-09-14T06:38:21Z | Sanborn 1906 vol.1 N&W sheet 110 (DeKoven 121-148) 25% preview
sanborn/v01NW_1906_sheet110_pct25.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790190601N:01790_01N_1906-0110/full/pct:25/0/default.jpg | 2026-09-14T06:43:31Z | Sanborn 1906 vol.1 N&W sheet 110 (DeKoven 121-148), 25% preview (1459x1802), fetched OK after one 522
parcels/overpass_memorial.json | https://overpass-api.de/api/interpreter (query in overpass_memorial.txt) | 2026-09-14T06:51:00Z | OSM historic/tourism/fire_station features near the site
sanborn/v01NW_1906_sheet110_full.jpg | https://tile.loc.gov/image-services/iiif/service:gmd:gmd410m:g4104m:g4104cm:g01790190601N:01790_01N_1906-0110/full/pct:100/0/default.jpg | 2026-09-14T06:53:13Z | Sanborn 1906 vol.1 N&W sheet 110 full resolution (LOC sanborn01790_001)
directories/ia_search_chicago_directory_1870_1873.json | https://archive.org/advancedsearch.php (title chicago directory, year 1870-1873) | 2026-09-14T06:56:38Z | search for 1870 and 1872 Edwards directories
texts/andreas02_leaf0786_s2.jpg | https://ia800807.us.archive.org/BookReader/BookReaderImages.php?zip=/20/items/historyofchicago02andr/historyofchicago02andr_jp2.zip&file=historyofchicago02andr_jp2/historyofchicago02andr_0786.jp2&id=historyofchicago02andr&scale=2&rotate=0 | 2026-09-14T06:56:55Z | Andreas, History of Chicago vol. II (1885) p.714 page image (Dalton statement + plat "West line of fire"), half resolution
texts/andreas02_leaf0780_s2.jpg | (same pattern, leaf 0780) | 2026-09-14T06:56:55Z | Andreas vol. II p.708 (barn description, engraving "O'Leary's barn", McDermott affidavit "east half of Lot 12, in Block 38")
texts/andreas02_scandata.xml | https://archive.org/download/historyofchicago02andr/historyofchicago02andr_scandata.xml | 2026-09-14T06:56:55Z | leaf-to-page map (leaf 780=p.708, 786=p.714)
texts/andreas02_meta.json | https://archive.org/metadata/historyofchicago02andr | 2026-09-14T06:56:55Z | item metadata (server/dir)
texts/musham_1940_p98_plan_4x.png | rendered locally from texts/papersinillinois1940illi.pdf page index 113 (printed p.98) at 4x with pymupdf | 2026-09-14T06:56:55Z | Musham 1940 plan "The Start of the Fire" (scale bar 0-100 ft)
texts/musham_plan_grid.png | local crop of the above with 100-px grid | 2026-09-14T06:56:55Z | used for digitising the plan
gcf_images/stereo_left_grid.png, gcf_images/stereo_cottage_front_grid.png | local crops of oleary_cottage_1871_abbott_stereograph_ichi-02741.jpg with grids | 2026-09-14T06:56:55Z | used for height estimate
sanborn/s110_*.png | local crops of v01NW_1906_sheet110_full.jpg | 2026-09-14T06:56:55Z | block 38/37 detail
atlases/zoom_clinton_dekoven_corner.png, atlases/zoom_jefferson_dekoven_corner.png, atlases/ordinance_fraction_zoom.png | local crops of nu_v1_section28_fullres.jpg / plate 27 ordinance table | 2026-09-14T06:56:55Z | corner labels and ordinance glyph
plan/plan_coords.py, plan/plan_coordinates.csv | computed locally from parcels/cook_parcels_2021_block.geojson + plat dimensions | 2026-09-14T06:56:55Z | 1871 plan coordinate table
texts/andreas02_leaf0781_s2.jpg, texts/andreas02_leaf0788_s2.jpg | (archive.org BookReaderImages pattern as above, leaves 0781=p.709, 0788=p.716) | 2026-09-14T07:01:03Z | Andreas vol. II pp.709, 716
plan/block38_plan_1871.png, plan/draw_plan.py | drawn locally from plan_coordinates.csv + musham_plan_digitized.csv | 2026-09-14T07:06:27Z | scaled drawing (4 px/ft), not a survey
plan/musham_plan_digitized.csv | digitised locally from texts/musham_1940_p98_plan_4x.png (4.12 px/ft) | 2026-09-14T07:06:27Z | Musham 1940 plan features in plan feet
REPORT.md | written locally | 2026-09-14T07:06:27Z | final report