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A whole class of maps was made neither to own land by nor to insure it, but to move through it — and Walkerton's traveller's maps survive at county scale, in the State Library's list, as a dated series this article reads as a class. The mail comes first, as it did on the ground: the United States Post Office Department's 1910 Map of St. Joseph County showing rural delivery service — rural free delivery drawn whole, the county as a web of mail routes out of its post offices, Walkerton among them, within living memory of the hack road of #130 — and its 1940s successor, the same rural-delivery county map reissued in the 194-? edition the library lists. The road maps follow the automobile: a Road Map of St. Joseph County of about 1928; Earl R. Feldman's Road Map, St. Joseph County, 1933 (at about 1:60,000), and his drainage map of 1934 beside it; the Indiana Highway Survey Commission's twin county sheets of about 1936, the Road map and the Cultural map, the state's first systematic traveller's-and-planner's pair; and then the official county highway series proper — the State Highway Commission's General Highway and Transportation Map, St. Joseph County, in editions of 1949, 1961, 1976 and 1980 in the library's list, the 1980 edition prepared with the Federal Highway Administration — the working ancestor of every county highway map since, and the sheet on which Walkerton's corridors carry their numbers at county scale.
Above the county class stands the state class, and it is the settler class of Transportation's GAP-W-TRN-5, read here as a class in its own right: the official Indiana state highway map series, published by the highway commission and its successors from the system's founding — the 1920 official highway map and the 1923, 1926 and 1929 maps among the Indiana Memory survivals — now digitized as an entire catalogue by INDOT in partnership with the Indiana State Library, each house supplying the years the other lacked, with the honest caveat that not every year was printed (maps sometimes ran two years, especially in the 1990s and 2000s). It is on this series, read as a series, that the designation facts the banked Spine prints (US 6 in Indiana from the 8 June 1931 federal approval, signed 1932 in the Story of Walkerton section's telling; State Road 6 under construction in 1928) are checkable year by year, and on which #134's bypass negative rests. The auto-trail era's commercial sheets close the class at the size reached: the 1920 Rand McNally automobile trails and highway map of the five-state region in the Indiana Memory results — the named-trail age drawn for the motorist — with the banked negatives governing its content for this ground: the Lincoln Highway it would show runs south of Walkerton, and Walkerton's presence on the trail-era sheets is as a town on lesser roads, which is the era's true statement about it.
Closure: DUG — the class read as a class: rural-delivery maps 1910 and 1940s; county road maps c.1928–1936; the General Highway and Transportation editions 1949–1980; the official state series whole as a digitized catalogue; the auto-trail sheet at the size reached.
Sources: Indiana State Library, St. Joseph County maps list, read whole (Post Office Department rural delivery maps, 1910 and 194-?; road map c.1928; Feldman 1933 and 1934; Highway Survey Commission Road and Cultural maps, c.1936; General Highway and Transportation Map editions 1949, 1961, 1976, 1980); INDOT, "Historic State Highway Maps Now Easily Available" (the official series digitized entire; biennial-printing caveat); Indiana Memory / Indiana State Library Map Collection search results (official highway maps of 1920, 1923, 1926, 1929; Rand McNally auto trails map, 1920), reached for this section; Transportation and Spine legs of this build.