Your search for ""usgsse39.75-77.875"" revealed the following:

~ Mercersburg PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 2010

~ Mercersburg PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, 2016

~ Mercersburg PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 2013

~ Mercersburg PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1990, updated 1995

~ Mercersburg PA topo map, 1:31680 scale, 7.5 X 7.5 Minute, Historical, 1944

~ Mercersburg PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1943, updated 1952

~ Mercersburg PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1943, updated 1984

~ Mercersburg PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1943, updated 1969

~ Mercersburg PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1943, updated 1952

~ Mercersburg PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1943, updated 1965

~ Mercersburg PA topo map, 1:24000 scale, 7.5 X 7.5 Minute, Historical, 1943, updated 1974