500+-+Pure+Science


 * 508 Encyclopedia of Life
 * 516 Geometry
 * 520 NASA
 * American Astronomical Society
 * Canadian Astronomical Society
 * European Southern Observatory
 * 574.012 Tree of Life Web Project
 * 580 The Plant List
 * 590 The Illustrated Encyclopedia of Animal Life
 * 595.7 The Encyclopedia of Insects
 * 597.6 The How and Why Wonder Book of Reptiles and Amphibians