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Your search for ""USGSNW38.75-107.875"" revealed the following:

Black Ridge Colorado Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 2013

~ Black Ridge CO topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 2013
Black Ridge Colorado Current topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 2016

~ Black Ridge CO topo map, 1:24000 scale, 7.5 X 7.5 Minute, 2016
Black Ridge Colorado Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 2010

~ Black Ridge CO topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 2010
Black Ridge Colorado Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1955

~ Black Ridge CO topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1955, updated 1956
Black Ridge Colorado Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1955

~ Black Ridge CO topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1955, updated 1969
Black Ridge Colorado Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1955

~ Black Ridge CO topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1955, updated 1980
Black Ridge Colorado Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1955

~ Black Ridge CO topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1955, updated 1956
Black Ridge Colorado Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1955

~ Black Ridge CO topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1955, updated 1969
Black Ridge Colorado Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1955

~ Black Ridge CO topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1955, updated 1980