Science 696 History 595 Natural history 313 Botany 308 Geology 284 Research 233 JUVENILE NONFICTION 210 more ... Mathematics 199 Science and state 181 Social aspects 158 Animals 156 Zoology 149 Spanish language materials 148 Climatic changes 145 Ecology 143 Technology 142 Study and teaching 127 Philosophy 119 Technology and state 115 Plants 111 Paleontology 97 General 93 Birds 92 Science & Nature 89 Scientists 89 Astronomy 88 Spanish 88 Biology 85 Physics 84 Bilingual 80 less ...