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Deutsche Unternehmen in der kaukasischen Manganindustrie 1900 - 1914
Lemke, Heinz, (1998)
Mangansee
Foders, Federico, (1985)
Manganerz
Szczepański, Fritz von, (1937)
Natural resources of the Soviet Union : their use and renewal
Armand, David Lʹvovič, (1971)
The Russo-Chinese borderlands : zone of peaceful contact or potential conflict?
Jackson, William A. Douglas, (1968)
Agrarian policies and problems in communist and non-communist countries
Jackson, William A. Douglas, (1971)