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Three legs of the banked build named the Sanborn sheets as a settler — Transportation's GAP-W-TRN-4, Arts & Culture's GAP-W-ART-1, Businesses' GAP-W6-4 and GAP-W6-5 — and no fragment stated the run's years. This article states them. The run was read in two independent carriers that agree edition for edition: the Library of Congress's Sanborn records for the town, as indexed in the county map-records list, and the Indiana State Library's Sanborn microfilm holdings list for the state, which files the town — the fact must be printed, because it will defeat any searcher who does not know it — under the spelling "Walkertown (Saint Joseph County)", the same rendering the Population leg met in the 1870 census schedule.
The run, verbatim as the two carriers give it. Library of Congress digitized editions (public domain, pre-1931): May 1886; December 1892; February 1898; 1904; 1909; 1922 — six editions, each titled in the Congress library's records "Sanborn Fire Insurance Map from Walkerton, Saint Joseph County, Indiana" with its date as given. The State Library holdings list continues the run past the digitized edge: 1886, 1892, 1898, 1904, 1909, 1922, 1929, 1929–1944 — a seventh edition of 1929, and the 1929 edition as corrected and pasted forward to 1944, the Depression-era Sanborn practice (a reissued base edition with pasted update slips in place of a redrawn survey) that the Indiana University Sanborn index describes for the state's towns generally. The measured run is therefore: first year 1886, last edition 1929, coverage carried forward by correction to 1944 — seven editions across forty-three years, at intervals of six, six, six, five, thirteen and seven years, the long 1909–1922 gap spanning the First World War. The state context fixes the run's size honestly: Indiana's Sanborn coverage as a whole runs 1883–1966 in the Indiana Spatial Data Portal's archive of 11,517 images for 305 locations, and Walkerton's seven editions are a small town's full share of it. A sheet-by-sheet read of the editions remains the named settler for the sheet-level gaps this run serves (GAP-W-TRN-4, GAP-W-ART-1, GAP-W6-4/5).
What the run covers, at the strength the class itself guarantees: Sanborn surveys were drawn at fifty feet to the inch (1:600), building by building — outline, size, shape and construction material of every structure in the surveyed district, heights and uses, street names and widths, property boundaries and house numbers — for the town's built core: the downtown blocks at the corridors' crossing (#133), both depots' ground, the mills and the opera house's block among them. That is why three legs named these sheets as settlers, and the naming can now be made precise for the assembly flags this read feeds: DF-W-69, GAP-W-TRN-4 and GAP-W-ART-1 each settle, when their sheet-reading is done, against editions that demonstrably exist — the depot question against any edition from 1886 forward, the opera house (attested in the Independent of April 1901) against the 1904 and 1909 editions first, the flour mill of GAP-W6-4 against the whole run. One measurement this read could not take: the sheet count of each edition. The Library of Congress's Sanborn advanced search — the database its fire-insurance guide describes, in which each record carries the edition's number of sheets — is the instrument that holds it, and its per-edition records for this town were not reached sheet by sheet in this section (the catalogue route to two editions returned the host's 403, honoured and not retried); the editions and years above stand complete without it, and the sheet counts stand as the run's one open measurement, with its settler named.
Closure: DUG — the run measured: editions May 1886, December 1892, February 1898, 1904, 1909, 1922, 1929; the 1929 edition corrected to 1944; first year 1886, last 1944 by correction. Sheet counts per edition: NAMED GAP, settler the Library of Congress Sanborn advanced search records for Walkerton (filed also under "Walkertown").
Sources: Library of Congress Sanborn records for Walkerton, as indexed in the LDS Genealogy / FamilySearch St. Joseph County map-records list, read whole for this section (the six pre-1931 editions with months as titled); Indiana State Library, Indiana Sanborn Maps S–Z holdings list ("Walkertown (Saint Joseph County): 1886, 1892, 1898, 1904, 1909, 1922, 1929; 1929–1944"), read for this section; Indiana University Libraries / Indiana Spatial Data Portal, Sanborn program records (Indiana coverage 1883–1966; 11,517 images; 305 locations; scale 1:600; post-Depression reissue-with-updates practice per the IU Sanborn index); Library of Congress, Fire Insurance Maps research guide (each advanced-search record carries the edition's sheet count; pre-1931 sheets public domain).