Your search for ""USGSNW68.75-161.4"" revealed the following:

~ Misheguk Mountain C 4 NW AK topo map, 1:25000 scale, 7.5 X 7.5 Minute, 2016

~ Misheguk Mountain C 4 AK topo map, 1:63360 scale, 15 X 15 Minute, Historical, 1984, updated 1984