Materia medica, Vegetable 59 Dissertations, Academic (Ph.D) 37 History 27 English literature 25 Thesis (Ph.D)-Education 22 Medicinal plants 19 History and criticism 15 Recent progress in medicinal plants -- Indexes--- Medicinal plants -- Research -- Indexes-- Materia medica, Vegetable -- Research -- Indexes 15 Drugs (Materia medica)-- Pharmacology 14 Botany, Medical 13 Botany 12 Medicine, Ayurvedic 12 Plants 12 Cell Biology-- Cytology 11 Recent progress in medicinal plants -- Indexes--Medicinal plants -- Research -- Indexes--Materia medica, Vegetable -- Research -- Indexes 11 Literature 10 Psychology 10 Criticism and interpretation 9 Cell biology 8 Materia medica 8 Social aspects 8 Criticism 7 English Literature 7 Feminism 7 Herbs 7 Medicine 7 Pharmacology and Toxicology 7 Philosophy 7 Psychoanalysis 7 Biography 6