Columbia subject headings:
Agriculture--Labor productivity--Asia, Central.
Agriculture--Labor productivity--Russia (Federation)--Russian Far East.
Collective farms--Asia, Central.
Collective farms--Russia (Federation)--Russian Far East.
Koreans--Asia, Central.
Koreans--Russia (Federation)--Russian Far East.
Harvard subject headings:
Agriculture--Labor productivity--Asia, Central.
Agriculture--Labor productivity--Russia (Federation)
Agriculture--Labor productivity--Russia (Federation)--Russian Far East.
Collective farms--Asia, Central.
Collective farms--Russia (Federation)--Russian Far East.
Koreans--Asia, Central.
Koreans--Russia (Federation)--Russian Far East.
Princeton subject headings: