Сырган - map search
Topographic map q49-3_4 of scale 1:500 000
Aykhal, Khabardino
Russian - Soviet military - 4Mb -
Asia - Irkutsk - Krasnoyarsk - Sakha
Topographic map q49_50 of scale 1:1 000 000
Martha, Morkoka, Udachnyy, Ulenkir-Kyuyel, Verkhniye Ostrova, Amysakh, Andyngda, Aykhal, Bagadya, Bagadzha
Russian - Soviet military - 5Mb -
Asia - Irkutsk - Krasnoyarsk - Sakha
Topographic map c05 of scale 1:1 000 000
Kotuj, Martha, Ozero Djupkun, Ozero Vivi, Ozero Essej, Ozero Agata, Morkoka, Mojero, Ozero Ajan, Ozero Bel'Duncana
English - US military - 1966 - 12Mb -
Asia - Irkutsk - Krasnoyarsk - Sakha - Taymyr
Topographic map nq49-50 of scale 1:1 000 000
Martha, Morkoka, Botulu, Khabardino, Kirova, Oldongdo, Onkuchakh, Shologontsy, Udachnyy, Ulenkir-Kyuyel
English - US military - 1957 - 2Mb -
Asia - Irkutsk - Krasnoyarsk - Sakha
Topographic map c05-c of scale 1:500 000
Martha, Morkoka, Onkuchakh, Shologontsy, Udachnyy, Ulenkir-Kyuyel, Verkhniye Ostrova, Andyngda, Aykhal, Ekonda
English - US military - 1989 - 9Mb -
Asia - Irkutsk - Krasnoyarsk - Sakha