Juvenile literature 109 Science 108 Animals 101 Experiments 66 Dinosaurs 59 Miscellanea 41 Plants 40 Mathematics 39 Insects 31 Weather 31 Marine animals 30 Birds 26 Earth 26 Life cycles 25 Water 25 Counting 24 Solar system 24 Astronomy 23 Light 21 Force and energy 19 Ocean 19 English fiction 18 Sharks 18 Pictorial works 17 Mammals 16 Endangered species 15 Reptiles 15 Butterflies 13 Conservation 13 Nature 13