Subjects: *AGRICULTURE; *AGRICULTURAL productivity; *FARM managementSOVIET Union
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Subjects: *AGRICULTURAL productivity; *ESTIMATION theory; *AGRICULTURAL policySOVIET Union
Subjects: *AGRICULTURAL productivity; *ELASTICITY (Economics)SOVIET Union
Subjects: AGRICULTURAL productivity; AGRICULTURE; MECHANIZATIONSOVIET Union
Subjects: *AGRICULTURAL productivity; *AGRICULTURE; *CROP yieldsSOVIET Union; UNITED States