Your search for ""USGSNE68.75-159.6"" revealed the following:

~ Misheguk Mountain C 2 NE AK topo map, 1:25000 scale, 7.5 X 7.5 Minute, 2016

~ Misheguk Mountain C 2 AK topo map, 1:63360 scale, 15 X 15 Minute, Historical, 1984, updated 1984