Zoology 287 Periodicals 29 Botany 28 Natural history 24 Description and travel 20 Animals 18 Bibliography 12 Zoology, Economic 12 Geology 11 Pictorial works 9 Wildlife conservation 9 Animal behavior 8 Collection and preservation 8 Laboratory manuals 8 Paleontology 8 Zoological specimens 8 Ecology 7 Classification 6 History 6 Nomenclature 6 Pre-Linnean works 6 Abstracts 5 Hunting 5 National parks and reserves 5 Physiology, Comparative 5 Research 5 Mollusks 4 Animal ecology 3 Biology 3 Birds 3