Juvenile literature 372 Science 108 Experiments 47 Mathematics 42 Animals 39 Astronomy 34 History 30 Plants 25 Statistics 24 Birds 22 Thesis 22 Botany 21 Environmental engineering 21 Miscellanea 21 Dictionaries 20 Earth sciences 20 Chemistry 17 Weather 17 Z1 16 Natural history 15 Physics 15 Algebra 14 Biography 14 Encyclopedias and dictionaries 14 Pictorial works 14 Study and teaching 14 Technology 14 Insects 13 Outer space 13 Dinosaurs 12