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Your search for ""usgsnw41.625-90.375"" revealed the following:

Port Byron Illinois Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 2012

~ Port Byron IL topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 2012
Port Byron Illinois Current topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 2015

~ Port Byron IL topo map, 1:24000 scale, 7.5 X 7.5 Minute, 2015
Port Byron Illinois Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 2010

~ Port Byron IL topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 2010
Port Byron Illinois Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1949

~ Port Byron IL topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1949, updated 1954
Port Byron Illinois Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1950

~ Port Byron IL topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1950
Port Byron Illinois Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1953

~ Port Byron IL topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1953, updated 1976
Port Byron Illinois Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1953

~ Port Byron IL topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1953, updated 1971
Port Byron Illinois Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1953

~ Port Byron IL topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1953, updated 1957
Port Byron Illinois Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1991

~ Port Byron IL topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1991, updated 1992