Drugs 146 Pharmacology and Toxicology 84 Pharmacology 36 Clothing and dress 32 Medicinal plants 31 Medicine 31 History 23 Pharmaceutical chemistry 22 Pesticides and Drugs; Control, (New March 2000) 21 Medicinal Plants 19 Economic botany 17 Research 17 Pharmacognosy 16 methods 15 Drug abuse 14 Drugs (Materia medica)-- Pharmacology 14 Pharmaceutical Preparations 14 Pharmacokinetics 14 Biological Control 13 Natural enemies 13 Therapeutic use 13 Biological control 12 Biotechnology 12 Chemical control 12 Dissertations, Academic (Ph.D) 12 Drug Design 12 Herbs 12 Microbiology 12 Plant Pests, (New March 2000) 12 Plant pests 12