Classification Plants 13 Books 9 Angiosperms 6 Folklore 6 Information organization 6 Folk literature 5 History and criticism 5 Indexing 5 Library Science 5 Library science 5 Botany 4 Cataloguing 4 Identification 4 Knowledge, Theory of 4 Library and information science 4 Bacteria 3 Colon classification 3 Dewey Decimal 3 Evolution 3 Research 3 Zoology 3 Agriculture 2 Bacteriology 2 Bibliography 2 Biology 2 Botony 2 Cataloging 2 Dissertations, Academic (Ph.D) 2 Fairy tales 2