Zim, Herbert Spencer; Robbins, Chandler S.; Bruun, Bertel (2001): Birds of North America: A Guide to Field Identification.
Trees of North America and Europe: A Guide to Field Identification, Revised and Updated.
Field Identification of Biological Warfare Threat Agents (FIBWA)
"Problems of Field Identification", The Auk 39:31-41.
"Modern Problems of Field Identification," Bird-Lore 38:12-18.
Birds of North America: A Guide to Field Identification.
Reptiles of North America - A Guide to Field Identification with Edmund D. Brodie, Jr. (1982)
Most note that they are a "Guide to Field Identification" on the cover.
Newcomb's Wildflower Guide: An Ingenious New Key System for Quick, Positive Field Identification of the Wildflowers, Flowering Shrubs and Vines of N, Vol.
