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The federal government eventually mapped this ground the way it mapped all ground — by quadrangle, at standard scales, in dated editions — and the quadrangle's name is the town's. The Walkerton quadrangle, Indiana, is a 7.5-minute sheet (1:24,000) of the US Geological Survey, spanning the ground between 86°30′ and 86°22′30″ west in the collar data of its modern editions, taking in the town, Lincoln Township's centre and the Kankakee-side country west of it — Minnow Branch, Hardy's Lake and Yellow Bank Creek among the hydrography its digital editions name, with Teegarden at its edge. The banked build has used this ground's federal geography all along without naming the sheet (the GNIS record, feature 2397718, in Before the City and the Story of Walkerton section); this article names it. The modern series is verified as documents: the US Topo editions of the Walkerton quadrangle dated 9 June 2010 and 18 October 2016 in the National Map's staged files, produced by the US Geological Survey in its 7.5-minute series — digital-native sheets, refreshed on the programme's cycle, carrying the town in the national topographic present.
Behind the US Topos stands the Historical Topographic Map Collection: the Survey's digital repository of its traditionally printed sheets, over 185,000 georeferenced files of maps printed between 1884 and 2006, served through topoView and the National Map Downloader — the settler instrument for this quadrangle's printed editions. What the quadrangle's predecessors would show, when pulled, is fixed by the ground's own chronology: a mid-century first edition would be the first federal sheet to draw the town whole since the atlas plates — the two surviving railroads, the lifted Belt still in place or still fresh, the Kingsbury doubling's houses new on the grid.
Closure: MIXED — quadrangle named and its US Topo editions of 2010 and 2016 DUG as documents; the printed-edition run (HTMC, 1884–2006 programme) a NAMED GAP. Settler: USGS topoView / the National Map Downloader, searched for the Walkerton quadrangle at 1:24,000, with the HTMC metadata for each edition.
Sources: US Geological Survey, US Topo 7.5-minute maps for Walkerton, IN (filed editions of 9 June 2010 and 18 October 2016; collar and content as above), reached for this section; USGS, Historical Topographic Maps — Preserving the Past (HTMC: printed maps 1884–2006; over 185,000 files; topoView and the National Map Downloader as its doors), read for this section; Indiana State Library blog, map-collection guidance (7.5-minute editions for Indiana dating back to the late 1940s — class fact); GNIS feature 2397718, as banked.