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SANBORN MAP COMPANY EDITIONS FOR NEW CARLISLE: 1886 · 1893 · 1899 · 1907 · 1929
What it is: the fire insurance survey of the built town, edition by edition — for a commercial core of this size, the single most detailed record of what stood where, built of what, used for what, across the town's formative half-century. The Indiana State Library's Sanborn holdings list (its M–R page, read first-hand) gives New Carlisle, St. Joseph County, five editions — 1886, 1893, 1899, 1907 and 1929 — held on the library's microfilm. The absence is printed at its true strength: it is a tested absence in the search of the LOC digital collection, not a proof that no copy exists anywhere in that library's vast un-digitized holdings; the editions' certain seat is the state library's film, and the sheets stand in the pull list to be read there (the pre-1923 Sanborns for Indiana also circulate in digitized form through the state university collections, a second route to the same sheets). For the build's purposes the Sanborns are the settler class for the district's building-by-building questions — footprints, materials, uses, and the railroad-era commercial row — at a grain no narrative source matches.
Principal sources: Indiana State Library, Sanborn map holdings list (read first-hand), for the five editions and their film seat; Library of Congress Sanborn collection, searched for New Carlisle with no item returned (tested absence, search strength).