| Queen Must Die, The | Longgood, William |
| Rare Animals | Akimushkin, I.; Butler, Jan (trans.) |
| Readings in Entomology | Barbosa, Pedro; Peters, T. Michael |
| Rearing and Studying Stick and Leaf-Insects | Brock, Paul D. |
| Rearing and Studying the Praying Mantids | Heath, George L. |
| Rearing Insects in Schools | Siverly, R.E. |
| Reconnecting With Nature; Finding Wellness Through Restoring Your Bond with the Earth | Cohen, Michael J. |
| Renewal of the Barry M. Goldwater Range Land Withdrawal: Final legislative Environmental Impact Statement | Air Force, U.S. |
| Reporter's Environmental Handbook | West, Bernadette;Sandman, Peter M.; Greenberg, Michael R. |
| Reptiles and Amphibians | Zim, Herbert S., Ph.D., Sc.D.; Smith, Hobart M., Ph.D. |
| Reptiles and Amphibians of the American Southwest | Heymann, M. M. |
| Revision of the Genus Pyrota.Ithe Mylabrina Group (Coleoptera:Meloidae) | Selander, Richard B. |
| Revision of the Honey Ants, Genus Myrmecocystus (Hymenoptera: Formicidae) | Snelling, Roy R. |
| Rivers of the West | Hogan, Elizabeth (Editor) |
| Rocks and Minerals, A Golden Guide | Zim, Herbert S.; Shaffer, Paul R. |
| Rocky Mountain Tree Finder | Watts, Tom |
| Run, The: A Chronicle of Migration and Survival in the Waters of Cape Cod | Hay, John |
| Sac Spiders of Canada and Alaska: Aranae: Clubionidae and Anyphaenidae | Dondale, Charles D.;Redner, James H. |
| Saguaro Book, The | Keasey, Merritt S. |
| Saguaro National Monument | Shelton, Napier |
| Saguaro We Going? Impacts of Population Growth in Eastern Pima County, Arizona | Rincon Group Population Committee |
| Saints of San Xavier | Ahlborn, Richard E. |
| San Javier Del Bac: A Living Mission | Frontain, Dick |
| Savage Garden: Cultivating Carnivorous Plants | D'Amato, Peter |
| Schoolyard Wildlife Activity Guide | Cronin-Jones |
| Science Activities in Energy: Elementary Edition | Arizona Energy Office |
| Science Activities in Energy: Secondary Edition | Arizona Energy Office |
| Sea of Cortez Marine Invertebrates | Kerstitch, Alex |
| Seashore Biology Notes - A Field Guide to the Common Animals in the Northern Gulf of California Tidepools | Warr, Diana |
| Seasons in the Desert: A Naturalist's Notebook | Tweit, Susan J. |
| Second Report on the Injurious and Other Insects of the State of New York | Linter, J.A. |
| Secondary Activity Guide | Project Wild |
| Secret Islands, The | Franklin, Russell |
| Seguy's Decorative Butterflies and Insects | Seguy, E.A. |
| Selection of Familiar Birds of North America | National Audobon Society |
| Seri Indians of Sonora, Mexico | Johnston, Bernice |
| Sharing the Joy of Nature: Nature Activities for All ages | Cornell, Joseph |
| Shimmer of Butterflies | Hunt, Joni Phelps |
| Sign Language for Everyone | Huffman, Jeanne;Hoffman, Bobbi, et al |
| Silent Spring | Carson, Rachel |
| Silent Spring | Carson, Rachel |
| Simon & Schuster's Guide to Insects | Arnett, Ross H., Jr.; Jacques, Richard L., Jr. |
| Six-legged Science | Hocking, Bryan |
| Six-legged Science: Insects in the Classroom | Dunn, Gary A. |
| Sky-Island National Biodiversity Conservation Area | Sky Island Alliance |
| Smithsonian Book of Invention, The | Smithsonian Exposition Books |
| Social Life Among Insects | Wheeler, William M. |
| Some Methods for the Statistical Analysis of Samples of Benthic Invertebrates | Elliot, J.M. |
| Somewhere Out There: Arizona's Lost Mines & Vanished Treasures |
Egerton, Kearney |
| Songbird Ecology in Southwestern Ponderosa Pine Forests: A Literature Review | Block, William M. et.al. |
| Sonoran Desert Resource Directory: Compendium of databases, library resources, websites... | The Nature Conservancy |
| Sonoran Desert Spring | Alcock, John |
| Sonoran Desert Summer | Alcock, John |
| Sonoran Desert, The | Helms, Christopher L. |
| Sonoran Desert, The | Helms, Christopher L. |
| Southern African Spiders: An Identification Guide | Filmer, Martin R. |
| Southern Arizona Nature Almanac | Hanson, Roseann Beggy;Hanson, Jonathon |
| Southwestern Coleoptera: Miscellaneous Collecting Notes: Part 1 | Duff, Robert |
| Southwestern Landscaping with Native Plants | Phillips, Judith |
| Southwestern Trees: A Guide to the Native Species of New Mexico and Tales | Little, Elbert L., Jr. |
| Spanish Made Simple | Jackson, Eugene; Rubio, Antonio |
| Spider Bob's Animal Oddyseys 1; Spiders, Scorpions, and other Arachnid Arizona | Breene, Robert B. |
| Spider book, The : A manual for the study... | Comstock, John Henry; Gertsch, W.J.,rev.&ed. |
| Spider communication: Mechanisms and Ecological Significance | Witt, Peter N.;Rovner, Jerome S. |
| Spider Genera of North America | Roth, Vincent D. |
| Spider Genera of North America, 3rd edition | Roth, Vincent D. |
| Spider Infraorder Mygalomorphae (Araneae): Cladistics and systematics | Raven, Robert J. |
| Spider Mites of Southwestern United States and a Revision of the Family Tetranychidae |
Tuttle, Donald M.; Baker, Edward W. |
| Spider, The | Crompton, John |
| Spider, The Story of a Predator and Its Prey | Jones, Dick |
| Spiders | Rockcastle, Verne N. |
| Spiders and Their Kin | Levi, Herbert W.; Levi, Lorna R.; Zim, Herbert |
| Spiders of Connecticut | Kaston, Benjamin Julian |
| Spiders of The United States | Headstrom, Richard |
| Spiders of the World | Preston-Mafham, Rod and Ken |
| Spiders: A Portrait of the Animal World | Sterry, Paul |
| Spiders: Jason Project Homepage... | Jason Foundation for Education |
| Spiders: The New Compact Study Guide and Identifier | Preston-Mafham, Ken |
| Spiders: Webs, Behavior, and Evolution | Shear, William A. |
| Spineless Wonders: Strange Tales from the Invertebrate World | Conniff, Richard |
| Spinner Family, The | Patterson, Alice Jean |
| Splendors of Nature | Smithsonian Institution of Natural History |
| Stars, A Golden Guide | Zim, Herbert S., Ph.D., Sc.D.; Baker, Robert H., Ph.D., Sc.D. |
| State of the Desert Biome: uniqueness, biodiversity, threats and the adequacy of protection in the Sonoron Bioregion | Nabhan, Gary Paul;Holdsworth, Andrew R. |
| Strange Lives of Familiar Insect, The | Teale, Edwin Way |
| Strangers in Our Midst | Friederici, Peter |
| Structure and Habits of Spiders, The | Emerton,J.H. |
| Studies of Fossiliferous Amber Arthropods of Chiapas, Mexico, Part II | Petrunkevitch, Alexander, et. al. |
| Study of Hybrids in Colias (Lepidoptera, Pieridae) | Ae, Shigeru Albert |
| Study of Insects, An Introduction to the | Borror, Donald J.; Delong, Dwight M. |
| Study of Insects, An Introduction to the (5th Ed.) | Borror, Donald J.; DeLong, Dwight M.; Triplehorn, Charles A. |
| Study of Insects, An Introduction to the (6th ed.) | Borror, Donald J.,Triplehorn, Charles A.; Johnson, Norman F. |
| Summer Island | Porter, Eliot |
| Supervisor's Handbook of Productivity and Quality Meetings | Bureau of Business Practice |
| Sutter Buttes: A Naturalist's View | Anderson, Walt |