Сонково - map search
Topographic map no37 of scale 1:1 000 000
English - US military - 1957 - 3Mb -
Topographic map o37 of scale 1:1 000 000
Russian - Soviet military - 4Mb -
Topographic map d03-c of scale 1:500 000
English - US military - 1993 - 11Mb -