Your search for ""usgsnw47.5-68.25"" revealed the following:

Grand Isle Maine Historical topographic map, 1:62500 scale, 15 X 15 Minute, Year 1940

~ Grand Isle ME topo map, 1:62500 scale, 15 X 15 Minute, Historical, 1940

Grand Isle Maine Historical topographic map, 1:62500 scale, 15 X 15 Minute, Year 1940

~ Grand Isle ME topo map, 1:62500 scale, 15 X 15 Minute, Historical, 1940

Grand Isle Maine Historical topographic map, 1:62500 scale, 15 X 15 Minute, Year 1940

~ Grand Isle ME topo map, 1:62500 scale, 15 X 15 Minute, Historical, 1940, updated 1947

Grand Isle Maine Historical topographic map, 1:62500 scale, 15 X 15 Minute, Year 1938

~ Grand Isle ME topo map, 1:62500 scale, 15 X 15 Minute, Historical, 1938, updated 1977