found: Gray & Osborne. City of Union Gap, Yakima County, Washington, general map, 1983:map recto (Union Gap)
found: LC data base, 1-31-84(hdg.: Union Gap, Wash.)
found: Helland, M. Old Town, c1983:t.p. (Old Town : the story of Union Gap) p. 6 (name used by residents: Old Town [capitalized throughout text])
found: NUCMC data from Washington State Historical Society for Northern Pacific Railroad Company, North Yakima, W.T., relocation, 1883-1887(Yakima City; now called Union Gap)
found: GeoNames, algorithmically matched, 2009(ppl; 46°33ʹ26ʺN 120°28ʹ30ʺW)