- A field guide to western birds, a completely new guide to field marks of all species found in North America west of the 100th meridian and north of Mexico, text and illustrations by Roger Tory Peterson ; maps by Virginia Marie Peterson
- Common spiders of North America, Richard A. Bradley ; illustrations by Steve Buchanan ; sponsored by the American Arachnological Society
- How to know the seaweeds, an illustrated manual for identifying the more common marine algae of both our Atlantic and Pacific coasts with numerous aids for their study, by E. Yale Dawson
- Tracks and trailcraft
- Seed identification manual, [by] Alexander C. Martin and William D. Barkley
- Illustrated genera of imperfect fungi,, by H.L. Barnett and Barry B. Hunter
- A field guide to the insects of America north of Mexico, by Donald J. Borror and Richard E. White ; color and shaded drawings by Richard E. White ; line drawings by the authors
- Mushrooms & other fungi of North America, by Roger Phillips, assisted by Geoffrey Kibby & Nicky Foy with editing help from Alick Henrici [and others]
- Trees of the central hardwood forests of North America, an identification and cultivation guide, Donald J. Leopold, William C. McComb, Robert N. Muller
- How to know the lichens, [by] Mason E. Hale
- Hawks in flight, the flight identification of North American raptors, Pete Dunne, David Allen Sibley, and Clay Sutton
- Mushrooms of the world., With 186 color plates by Laura Maggiora. Translated by Ronald Strom
- How to know the minerals and rocks
- Forest trees of Illinois, by Robert H. Mohlenbrock ; photography by John A. Richardson and Robert H. Mohlenbrock ; illustrations by Miriam Wysong Meyer and Fredda J. Burton
- Family matters, secrecy and disclosure in the history of adoption, E. Wayne Carp
- A field guide to shells of the Pacific Coast and Hawaii, by Percy A. Morris
- A complete field guide to nests in the United States,, including those of birds, mammals, insects, fishes, reptiles, and amphibians,, by Richard Headstrom
- The common insects of North America, by Lester A. Swan and Charles S. Papp ; foreword by Evert I. Schlinger. Illus. by Charles S. Papp
- Eastern birds, John Farrand, Jr
- How to know the grasses;, pictured-keys for determining the common and important American grasses, with suggestions and aids for their study
- Wild food plants of Indiana and adjacent states, Alan McPherson and Sue McPherson ; drawings by John Brooks
- Wild flowers of Ohio and adjacent States,, by Isabelle H. Klein. Original illus. by Ruth C. Mayer, rev. for this ed. by Mary Thomas
- About life, concepts in modern biology, by Paul S. Agutter and Denys N. Wheatley
- How to know the insects,, an illustrated key to the more common families of insects, with suggestions for collecting, mounting and studying them
- A field guide to the mammals, field marks of all North American species found north of Mexico, text and maps by William Henry Burt ; ill. by Richard Philip Grossenheider ; sponsored by the National Audubon Society and National Wildlife Federation
- Hopi kachina dolls, with a key to their identification, by Harold S. Colton ; color photographs by Jack Breed
- Mammals of North America, Nora Bowers, Rick Bowers, and Kenn Kaufmann
- National Audubon Society field guide to North American mushrooms, Gary H. Lincoff ; visual key by Carol Nehring
- How to know pollen and spores, [by] Ronald O. Kapp
- Mushrooms of North America, [by] Orson K. Miller, Jr
- Flora of Missouri
- A pocket guide to sharks of the world, illustrated by Marc Dando ; text by David A. Ebert and Sarah Fowler
- Insects that feed on trees and shrubs, by Warren T. Johnson and Howard H. Lyon ; contributing authors, C.S. Koehler, J.A. Weidhaas
- The bees in your backyard, a guide to North America's bees, Joseph S. Wilson & Olivia Messinger Carril
- The National Audubon Society field guide to North American seashore creatures, Norman A. Meinkoth
- Stokes field guide to birds, Donald and Lillian Q. Stokes
- Our northern shrubs and how to identify them., With a new appendix of nomenclatural changes by Edward G. Voss
- The Sibley guide to birds, written and illustrated by David Allen Sibley
- Invasive plants of the Upper Midwest, an illustrated guide to their identification and control, Elizabeth J. Czarapata
- A guide to the identification of the genera of bacteria,, with methods and digests of generic characteristics,, by V.B.D. Skerman
- The National Audubon Society field guide to North American birds, John Bull and John Farrand, Jr. ; revised by John Farrand ; visual Key by Amanda Wilson and Lori Hogan
- The butterfly book, an easy guide to butterfly gardening, identification, and behavior, Donald and Lillian Stokes and Ernest Williams
- Trees of the northern United States and Canada, John Laird Farrar
- Grasses: Bromus to Paspalum, [by] Robert H. Mohlenbrock
- Vertebrates of the United States, W. Frank Blair [and others]
- How to know the ferns, a guide to the names, haunts, and habits of our common ferns, by Francis Theodora Parsons ; illustrated by Marion Satterlee and Alice Josephine Smith
- The shrub identification book;, the visual method for the practical identification of shrubs, including woody vines and ground covers., Photos. by A.W. Merwin
- The Sibley guide to trees, written and illustrated by David Allen Sibley
- A field guide to Pacific Coast fishes of North America, from the Gulf of Alaska to Baja, California, William N. Eschmeyer, Earl S. Herald ; illustrations by Howard Hammann, Katherine P. Smith, associate illustrator
- Newcomb's Wildflower guide, an ingenious new key system for quick, positive field identification of the wildflowers, flowering shrubs and vines of Northeastern and North Central North America, Lawrence Newcomb ; illustrated by Gordon Morrison ; foreword by Roland C. Clement