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  1. 1
    Published 1989
    Moskva : "Nauka", 1989.
    252 p. : ill. ; 23 cm.
    Subjects: “...Agricultural productivity....”
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  2. 2
    Published 1983
    Moskva : Izd-vo "Nauka", 1983.
    285 p. : ill. ; 22 cm.
    Subjects: “...Agricultural productivity....”
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