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Your search for "area43.62543.5-98-97.875" revealed the following:

Ethan South Dakota Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1957

~ Ethan SD topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1957, updated 1958