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Subject
- Agriculture68
- History27
- Forests and forestry17
- Collective farms11
- Economic aspects11
- Farm management8
- Plant breeding8
- State farms8
- Grain7
- Physiology7
- Plant geneticists7
- Fisheries6
- Mechanical properties6
- National parks and reserves6
- Pine6
- Vavilov, N. I. (Nikolaĭ Ivanovich), 1887-19436
- Accounting5
- Agriculture and state5
- Breeding5
- Plant breeders5