big springs - map search
Topographic map g20 of scale 1:1 000 000
English - US military - 1989 - 16Mb -
Topographic map k13 of scale 1:1 000 000
Russian - Soviet military - 4Mb -
Topographic map f16 of scale 1:1 000 000
English - US military - 1981 - 15Mb -