| Quick, Horace F. | Population Ecology |
| Rabkin, Richard & Jacob | Nature in the West - A Handbook of Habitats |
| Raham, R. Gary | Dinosaurs in the Garden |
| Raham, R. Gary | Explorations in Backyard Biology: Drawing on Nature in the Classroom,Grades 4-6 |
| Raithel, Christopher | American Burying Beetle (Nicrophorus americanus): Recovery Plan |
| Ramirez, Roberto De La Maza | Mariposas Mexicanas: Guia Para Su Colecta y Determinacion |
| Rand-McNally & Co. | Premier World Atlas |
| Rapp, William F. | Catalog of Spiders of Nebraska |
| Rapport, Samuel; Wright, Helen; Eds. | Crust of the Earth, The |
| Raven, Robert J. | Spider Infraorder Mygalomorphae (Araneae): Cladistics and systematics |
| Rehder, Harald A. | Audubon Society Field Guide to North American Seashells |
| Reid, George K. | Pond Life |
| Rensch, Bernhard | Evolution Above the Species Level |
| Resources for Natural Living | Connecting Arizona |
| Rethmel, R. C. | Backpacking |
| Reynolds, Christopher | Pond on My Windowsill, The |
| Rhodes, Frank H. T. | Geology, A Golden Guide |
| Rhodes, Frank H.T.; Zim, Herbert S.; Shaffer, Paul R. |
Fossils, A Golden Guide |
| Richman, D. B., et al. | Manual of the Grasshoppers of New Mexico, A |
| Richman, D.B.; Lighfoot, D.C.; Sutherland, C.A. | Manual of the Grasshopper of New Mexico, A; Handbook 7; Orthoptera: Acrididae and Romaleidae |
| Richman, David B.; Sutherland, Carol A.; Christian, Y. Oseto. |
One Hundred Common Insects of New Mexico |
| Rickett, Harold William | Wild Flowers of the United States: The Southwestern States |
| Ricklefs, Robert E. | Ecology |
| Ricklefs, Robert E. | Economy of Nature, The |
| Riely, Sara | Connecting Arizona: Resources for Natural Living |
| Rincon Group Population Committee | Saguaro We Going? Impacts of Population Growth in Eastern Pima County, Arizona |
| Rios, Joanne | Vamos A Conversar, Conversational Spanish through Pictures |
| Rios, Miguel Angel Moron | Escarabajos, 200 Millones de Anos de Evolucion |
| Rittner, Don | Ecolinking: Everyone's Guide to Online Environmental Information |
| Roberts, Mervin F. | All About Land Hermit Crabs |
| Robinett, Terri L. | Frameworks for Teachers" |
| Robinett, Terri L. | Internet for Seniors |
| Robinson, Andy | Grassroots Grants: An Activist's Guide to Proposal Writing |
| Rockcastle, Verne N. | Spiders |
| Rodionov, V.V.;Shabarshov, I.A. | Natural World for Queen and Colony |
| Romoser, William S. | Entomology, The Science of |
| Root, A.I. | ABC and XYZ of Bee Culture |
| Ross, Edward S. | Insects Close Up: A Pictorial Guide for Photographer and Collector |
| Ross, Edward S. and Roberts, H. Radclyffe | Mosquito Atlas, Part I |
| Ross, Edward S. and Roberts, H. Rayclyffe | Mosquito Atlas, Part II |
| Ross, Herbert H. | Textbook of Entomology, 3rd Ed |
| Roth, Vincent D. | Handbook for Spider Identification |
| Roth, Vincent D. | Spider Genera of North America |
| Roth, Vincent D. | Spider Genera of North America, 3rd edition |
| Rothschild, Miriam; Schlein, Yosef; Ito, Susumo |
Colour Atlas of Insect Tissues via the Flea, A |
| Ryckman, Raymond E. | Biosystematics and Hosts of the Triatoma Protracta Complex in North America (Hemiptera: Reduviidae) (Rodentia: Cricetidae) |
| Sacamano, Charles M.; Jones, Warren D. | Native Trees and Shrubs for Landscape Use in the Desert Southwest |
| San Diego Natural History Association; Association of Systematic Collections |
Federal and International Scientific Permits: A workshop for natural history museums and collectors |
| Sanderson, Ivan T. | Animal Treasure |
| Sanderson, Ivan T. | Carribean Treasure |
| Sargent, William | Year of the Crab, The |
| Savory, Theodore | Arachnida |
| Schaefer, John P.;Chinn,Celestine; McCarty,Kieran |
BAC: Where the Waters Gather |
| Schaefer, Vincent J.; Day, John A. | Field Guide to the Atmosphere |
| Schlenz, Mark A. | Exploring the Southwest's Grand Circle |
| Schultz, Stanley A. | Tarantula Keeper's Guide, The |
| Scientific American Book, A | Biosphere, The |
| Scott, James A. | Butterflies of North America, The |
| Sears, Paul B. | Where There is Life, An Introduction to Biology |
| Seguy, E.A. | Seguy's Decorative Butterflies and Insects |
| Selander, Richard B. | Revision of the Genus Pyrota.Ithe Mylabrina Group(Coleoptera:Meloidae) |
| Seymour, Peter (Editor) | Living River, The |
| Shafer, George D. | Ways of a Mud Dauber, The |
| Shattuck, Steven O. | Generic Revision of the Ant Subfamily Dolichoderinae (Hymenoptera : Formicidae) |
| Shaw, William W.;et.al. | Wildlife Habitats in Tucson: A Strategy for Conservation |
| Shear, William A. | Spiders: Webs, Behavior, and Evolution |
| Shelton, Napier | Saguaro National Monument |
| Shipman, Barbara A. | Medical and Dietary Uses of Honey |
| Silverstein, Alvin and Virginia | Animal Invaders |
| Simon, Hilda | Exploring the World of Social Insects |
| Simon, Hilda | Insect Masquerades |
| Simon, Hilda | Our Six-legged Friends & Allies |
| Siverly, R.E. | Rearing Insects in Schools |
| Sky Island Alliance | Sky-Island National Biodiversity Conservation Area |
| Slanksky, Frank Jr.;Rodriguez, J. G. | Nutritional Ecology of Insects, Mites, Spiders, and Related Invertebrates |
| Slapin, Beverly; Seale, Doris | Through Indian Eyes: The Native Experience in Books for Children |
| Slingsby, Peter | Ants of the Western Cape |
| Slinguff, Jim | Verde River Recreation Guide |
| Smart, John, M.A., D.Sc. | British Museum (Natural History) Instructions for Collectors, No. 4A, Insects |
| Smart, Paul | Butterfly World, The Illustrated Encyclopedia of |
| Smith, Andrew M. | Tarantula Spiders: Tarantulas of the USA and Mexico |
| Smith, Cecelia; Gondor, Anne; et al | Native Environments Workshop Series, The |
| Smith, Howard G. | Hunting Big Game in the City Parks |
| Smith, Kenneth G.V . | Insects and Other Arthropods of Medical Importance |
| Smith, Robert L. | Venomous Animals of Arizona |
| Smithsonian Exposition Books | Smithsonian Book of Invention, The |
| Smithsonian Institution | Annual Report of the Smithsonian Institution |
| Smithsonian Institution of Natural History | Splendors of Nature |
| Snelling, Roy R. | Revision of the Honey Ants, Genus Myrmecocystus (Hymenoptera: Formicidae) |
| Snodgrass, R.E. | Principles of Insect Morphology |
| Snow, Keith | Arachnids, The; An Introduction |
| Snyder, Ernest | Arizona Field Guide |
| Snyder, Tango Parrish; Ed. in Chief | Biosphere Catalogue, The |
| Snyder, Tango Parrish; Ed. in Chief | Biosphere Catalogue, The |
| Socal, Robert L.; Sneath, Peter H. | Principles of Numerical Taxonomy |
| Sonoran Arthropod Studies Institute | 1993 Invertebrates in Captivity Conference Proceedings: SASI/ITAG Conference |
| Sonoran Arthropod Studies Institute | 1994 Invertebrates in Captivity Conference Proceedings |
| Sonoran Arthropod Studies Institute | 1995 Invertebrates in Captivity Conference Proceedings |
| Sonoran Arthropod Studies Institute | 1996 Invertebrates in Captivity Conference Proceedings |
| Sonoran Arthropod Studies Institute | 1997 Invertebrates in Captivity Conference Proceedings |
| Sonoran Arthropod Studies Institute | 1997 Invertebrates in Captivity Conference: Program |
| Sonoran Arthropod Studies Institute | 1998 Invertebrates in Captivity Conference Proceedings |
| Sonoran Arthropod Studies Institute | 1999 Invertebrates in Captivity Conference Proceedings |
| Sonoran Arthropod Studies Institute | Investigating Arthropods with Discovery Scope |
| Southwest Parks and Monuments Association | Tumacacori |
| Southwood, T. R. E. | Ecological Methoods |
| Spencer, Kevin C., ed. | Chemical Mediation of Coevolution |
| Spevak, Edward M. | List of Terrestrial Invertebrates of Conservation Concern |
| Stanek, V.J. | World of Nature |
| Stanek, V.J. | Pictorial Encyclopedia of Insects |
| Starck, Walter A. II; Brundza, Paul | Art of Underwater Photography, The |
| Stehr, Frederick W. | Immature Insects |
| Stelley, Diane G. | Beekeeping, An Illustrated Handbook |
| Stephen, W.P.; Bohart, G.E.;Torchio, P.F. | Biology and External Morphology of Bees, The |
| Sterling, Dorothy | Insects and the Homes They Build |
| Sterry, Paul | Spiders: A Portrait of the Animal World |
| Stokes, Donald and Lillian; Williams, Ernest | Butterfly Book, The |
| Stokes, Donald W. | Guide to Observing Insect Lives, A |
| Stokoe, W.J. | Observer's Book of Butterflies |
| Stoll, N. R. et al, ed. | International Code of Zoological Nomenclature |
| Stone, Steven E. | Food Plants of World Saturniidae |
| Storer, John H. | Web of Life, The |
| Strunnikov, V.A. | Control of Silkworm Reproduction, Development, and Sex |
| Stuart, Frank S. | City of Bees |
| Stuart, Frank S. | City of Bees |
| Subik, Rudolf; Tr. by Kuthanova, Olga | Decorative Cacti |
| Sunset Magazine Editors | Gardening in Containers |
| Suthers, Roderick A; Gallant, Roy A. | Biology, The Behavioral View |
| Swan, Lester A.; Batt, Charles | Common Insects of North America |