Plant Biotechnology 57 History 31 Prisons 29 Prisoners 28 Biotechnology 20 Political prisoners 18 Women prisoners 18 Mathematics 17 Philosophy 17 Human rights 16 Plant Biotechnology and Molecular Biology 16 Prion, Viral, Bacterial and Fungal Pathogens of Animals, (New March 2000) 16 Chemistry 15 Criminal justice, Administration of 15 Ecology 15 Engineering 15 Politics and government 15 Punishment 15 Computer science 14 Microbiology 14 Prion, Viral, Bacterial and Fungal Pathogens of Humans, (New March 2000) 14 Data mining 13 Research 13 Social conditions 13 Women 13 Man 12 Human diseases 11 Female offenders 10 Plant Pathology 10 methods 10