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Description and travel
4
Siberia (Russia)
4
Africa
2
Amur River region (China and Russia)
2
Animal behavior
2
Asia
2
Central
2
Early works to 1800
2
Kamchatka Peninsula (Russia)
2
Marine animals
2
Pacific Ocean
2
Plants
2
Russia (Federation)
2
Sakhalin (Sakhalinskaia oblast)
2
Siberia
2
Social life and customs
2
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