| Nabhan, Gary Paul | Global List of Threatened Vertebrate Wildlife Species Serving as Pollinators for Crops and Wild Plants |
| Nabhan, Gary Paul and John Carr, ed. | Ironwood: An Ecological and Cultural Keystone of the Sonoran Desert |
| Nabhan, Gary Paul;Holdsworth, Andrew R. | State of the Desert Biome: uniqueness, biodiversity, threats and the adequacy of protection in the Sonoron Bioregion |
| Nardi, James B. | Close Encounters with Insects and Spiders |
| Nash, Roderick | Wilderness of the American Mind |
| National Academy of Sciences | Insect Pest Control and Management |
| National Audobon Society | Selection of Familiar Birds of North America |
| National Consortium for Environmental Education and Training |
Workshop Resource Manual for Teacher Educators |
| National Geographic Society | Field Guide to the Birds of North America |
| Natural Science for Youth Foundation | Directory of Natural Science Centers |
| Neary, John | Insects & Spiders |
| Neihaus, Theodore | Field Guide to Southwestern and Texas Wildflowers, A |
| Nelson, Dick & Sharon | Easy Field Guide to Common Desert Insects of Arizona |
| Nelson, Dick & Sharon | Easy Field Guide to Common Trees of Arizona |
| Nelson, Dick & Sharon | Easy Field Guide to Common Desert Mammals of Arizona |
| Nelson, Dick & Sharon | Easy Field Guide to Common Desert Cactus of Arizona |
| New, T. R. | Butterfly Conservation |
| New, T. R. | Directory of Lepidoptera Conservation Projects |
| Newman, L. Hugh | Ants From Close Up |
| Newmark, John & George | To the Zoo in a Plastic Box |
| Nichol, John | Bites and Stings: The World of Venomous Animals |
| Nielson, M. W. | Leafhopper Vectors of Phytopathogenic Viruses (Homoptera, Cicadellidae) Taxonomy, Biology, and Virus Transmission |
| Nielson, M. W. | Leafhopper Vecotrs of Phytopathogenic Viruses (Homoptera, Cicadellidae) Taxonomy, Biology and Virus Transmission |
| North, Eric | Ant Men, The |
| O'Toole, Christopher | Insects in Camera |
| O'Toole, Christopher, Editor | Encyclopedia of Insects, The |
| Odum, Eugene P. | Fundamentals of Ecology |
| Oldroyd, Harold | Elements of Entomology |
| Oldroyd, Harold | Elements of Entomology: An Introduction to the Study of Insects |
| Oldroyd, Harold | Natural History of Flies, The |
| Olin, George; Jackson, Earl, Ed. | House in the Sun |
| Olin, George; Jackson, Earl, Ed. | House in the Sun |
| Olney, P. J. S. ed. | International Zoo Book 30 |
| Opler, Paul A. | Butterflies and Moths:A Simplified Field Guide... |
| Opler, Paul A. | Butterflies of the America West; A Coloring Album |
| Opler, Paul A. | Eastern Butterflies: Peterson Field Guides |
| Opler, Paul A. | Western Butterflies; Peterson Field Guides, Second Edition |
| Organ Pipe Cactus National Monument | Draft-General Management Plan... |
| Organ Pipe Cactus National Monument | Final General Management Plan... |
| Oster, George F.; Wilson, Edward O. | Caste and Ecology in the Social Insects |
| Painter, Muriel Thayer | Yaqui Easter, A |
| Painter, Muriel Thayer; Sayles, E. B. | Faith, Flowers and Fiestas: The Yaqui Indian Year... |
| Palmer, Allison R.; | Miocene Arthropods from the Mojave Desert California |
| Patent, Dorothy Hinshaw | How Insects Communicate |
| Patraw, Pauline Mead | Flowers of the Southwest Mesas |
| Patterson, Alice Jean | Spinner Family, The |
| Paulus, Trina | Hope for the Flowers |
| Perrero, Laurie and Louis | Tarantulas: In Nature and as Pets |
| Peterson, Alvah | Larvae of Insects |
| Peterson, Roger Tory | Field Guide to the Birds |
| Peterson, Roger Tory | Field Guide to Western Birds |
| Peterson, Roger Tory | How to Know the Birds |
| Peterson, Roger Tory; McKenny, Margaret | Field Guide to Wildflowers of North Eastern & North Central North America |
| Petrunkevitch, Alexander, et. al. | Studies of Fossiliferous Amber Arthropods of Chiapas, Mexico, Part II |
| Philbrick, Helen & John | Bug Book, The; Harmless Insect Controls |
| Phillips, Allan; Marshall, Joe; Monson, Gale | Birds of Arizona, The |
| Phillips, Judith | Southwestern Landscaping with Native Plants |
| Pielou, E. C. | Ecological Diversity |
| Pinto, John D. | Behavior and Taxonomy of the Epicauta Maculata Group(Coleoptera Meloidae) |
| Pinto, John D. | Classification of the Genus Eupompha(Coleoptera Meloidae) |
| Platnick, Norman I. | Advances in Spider Taxonomy 1988-1991 |
| Platt, Robert B. and John F. Griffiths | Environmental Measurement and Interpretation |
| Platt, Rutherford | Great American Forest, The |
| Platt, Rutherford | This Green World |
| Poiner, George O., Jr.;Thomas, Gerard M. | Laboratory Guide to Pathogens and Parasites |
| Polzer, Charles,S.J.; Bufkin, Donald | Kino Guide, A : A Life of Eusebio Francisco Kino, Arizona's First Pioneer and a Guide to his Missions and Monnuments |
| Popovac, Gwynn | Conversations With Bugs: A Journal with Words and Drawings |
| Porter, Eliot | Summer Island |
| Porter, Eliot, from Henry David Thoreau | In Wildness Is the Preservation of the World |
| Potter, Anthony | Killer Bees, The |
| Pough, Frederick H. | Field Guide to Rocks and Minerals, fourth edition |
| Powell, Jerry A.; Hogue, Charles L. | California Insects |
| Pray, Leon L. | Taxidermy |
| Prchal, Steven J. | Colony Foundation and Associated Behavior in Three Arizona Ants |
| Preston-Mafham, Ken | Spiders: The New Compact Study Guide and Identifier |
| Preston-Mafham, Rod and Ken | Butterflies of the World |
| Preston-Mafham, Rod and Ken | Encyclopedia of Land Invertebrate Behavior, The |
| Preston-Mafham, Rod and Ken | Encyclopedia of Land Invertebrate Behavior, The |
| Preston-Mafham, Rod and Ken | Spiders of the World |
| Price, Peter W. | Insect Ecology, 2d ed. |
| Project Wild | Elementary Activity Guide |
| Project Wild | Secondary Activity Guide |
| Proneck, Neal | Hermit Crabs |
| Pyle, Robert Michael | Audubon Society Field Guide to North American Butterflies |