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Your search for ""USGSNW40.375-79.75"" revealed the following:

Irwin Pennsylvania Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 2013

~ Irwin PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 2013
Irwin Pennsylvania Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 2010

~ Irwin PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 2010
Irwin Pennsylvania Current topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 2016

~ Irwin PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, 2016
Irwin Pennsylvania Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1953

~ Irwin PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1953, updated 1979
Irwin Pennsylvania Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1953

~ Irwin PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1953, updated 1979
Irwin Pennsylvania Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1953

~ Irwin PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1953, updated 1964
Irwin Pennsylvania Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1953

~ Irwin PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1953, updated 1955
Irwin Pennsylvania Historical topographic map, 1:24000 scale, 7.5 X 7.5 Minute, Year 1953

~ Irwin PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1953, updated 1970