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An Illustrated Historical Atlas of St. Joseph County, Chicago, 1875 — plates read from the page images (public domain, via the Internet Archive)
What it is: the nineteenth-century atlas of the checklist, and for this ground a measuring instrument as much as a book. The Land leg read three plates whole: Walkerton itself (p. 41), West Troy (p. 40) — the rival plat across the township line whose single census life the Population leg prints — and the Lincoln Township plates (pp. 46–47), on which Pine Creek stands lettered across West Troy's north edge. Against the atlas the build reads the plat geography the survey grid predicts (township 35 north, range 1 west, sections 23–26 and 13, with the sliver of range 1 east), and the patrons' and landowners' names lettered on the farms are the 1875 ground truth the Neighborhoods leg's plat-by-plat account is checked against. Atlases of this class were subscription works — a name's presence bought, its absence proving nothing — and the build uses the plates for geography and occupancy, never for completeness.
Principal sources: the 1875 atlas, plates as above, read from page images; the Land leg's survey measurement for the grid the plates are read against.