Plant Breeding and Genetics 43 History 42 Biotechnology 38 Genetic Engineering, Gene Transfer and Transgenics, (New June 2002) 36 Molecular Biology and Molecular Genetics, (Discontinued March 2000, Reinstated and Revised June 2002) 33 Education 32 Biotechnology (General), (Revised June 2002) 29 Plants 26 Research 25 Genetically engineered organisms 24 Social Sciences 23 Genetic engineering 22 Marxism-Leninism-- Political Ideologies 21 Viral, Bacterial and Fungal Diseases of Plants, (New March 2000) 21 Plant breeding 20 Biography 19 English poetry 19 Genetics 19 Plant Production 19 Plant diseases 19 Transgenic plants 19 International economics 18 Plant Pests, (New March 2000) 18 Criticism 17 Lenin 17 Plant Physiology and Biochemistry 17 Agricultural Economics 16 Ecology 16 Horticultural Crops, (New March 2000) 16 Leninism 16