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1883 – 1966 · Run B #186
Tested negative, with the county's positive runs placed beside it: the Sanborn Map Company surveyed Indiana's insurable towns from the 1880s to the middle 1950s — as many as ten editions for some towns, in the State Library's summary — and the state's whole Sanborn inheritance is unusually complete: the Indiana Spatial Data Portal archive holds all 11,517 Indiana Sanborn images, 1883–1966, from the near-complete state collection at Indiana University. The test for this ground was run in the three doors that open on that record. At the Library of Congress, whose Sanborn collection is digitized whole for the public-domain years, a search for Osceola, Indiana returns no survey — the county's LoC Sanborn sheets are its cities' and its larger villages': South Bend, Mishawaka, and North Liberty among them. The Indiana State Library's Sanborn page carries the state list by city on microfilm; no Osceola entry stands in the record reached. The state archive's own coverage statement is the frame: Sanborn surveyed urban areas of insurable density, and Osceola — unincorporated through the whole classic Sanborn era, a village of a few hundred with a mill, a depot and a main street of frame stores — was exactly the class of place the company's agents passed through on the train to Mishawaka. Verdict: no Sanborn survey of Osceola was published in the record reached; the run for this ground is zero sheets, zero years — printed as a tested negative, not an omission, because the Sanborn question was left open in the Businesses leg as a conditional settler (“the Sanborn fire-insurance record if Osceola was ever surveyed”), and this test closes the condition: it was not, at any strength the national and state lists support. The settling instrument for absolute proof is named: the Sanborn index at Indiana University's Wells Library and the ISDP spatial search, read for the Osceola place-name — a physical-index check, named rather than inflated into the web result above.
Library of Congress, Sanborn Maps collection and Fire Insurance Maps research guide (the collection searched for Osceola, Indiana; the county's returned surveys named); Indiana State Library, Sanborn Maps page (the state frame, 1880s–mid-1950s, the by-city microfilm list); IndianaView / Indiana Spatial Data Portal, Indiana Historic Sanborn Maps project (11,517 images, 1883–1966, public-domain years downloadable); this build's Businesses leg (the conditional Sanborn settler) via the audit register.