1980. United States. Soil Conservation Service. "Base compiled from U.S.G.S. quadrangle sheets and county highway map, polyconic projection."; "50,000 foot grid ticks based on the Texas state pla... The Service (Fort Worth, Tex.).
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1978. United States. Soil Conservation Service. "Base compiled from Texas general highway map, polyconic projection."; "50,000 foot grid based on Texas coordinate system, central zone."; Jan. 197... The Service (Fort Worth, Tex.).