MA: American Birding Association Field Guide to Birds of Massachusetts George Mayfield Massachussets December 6, 2016
Birds of the Horn of Africa: Ethiopia, Eritrea, Djibouti, Somalia, and Socotra (Princeton Field Guides) George Mayfield Africa, Birds November 30, 2016
Mammals of North America: Second Edition (Princeton Field Guides) George Mayfield Mammals February 24, 2017
Birds of Mexico and Central America George Mayfield Belize, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, Mexico & Central America, Nicaragua, Panama April 11, 2017
The Birds of Panama: A Field Guide (Zona Tropical Publications) George Mayfield Mexico & Central America, Panama March 3, 2016
A Field Guide to the Birds of New Zealand (Princeton Pocket Guides) George Mayfield Australia, New Zealand, South Pacific, New Zealand March 22, 2016
A Field Guide to the Birds of the West Indies (Peterson Field Guides) George Mayfield Caribbean, Cuba February 24, 2017
NC, SC: American Birding Association Field Guide to Birds of the Carolinas (American Birding Association State Field) George Mayfield North Carolina, South Carolina December 6, 2016
Peterson Field Guide to Reptiles and Amphibians of Eastern and Central North America, Fourth Edition (Peterson Field Guides) George Mayfield Reptiles & Amphibians, Reptiles & Amphibians: North America July 8, 2016
 Wildlife of Ecuador: A Photographic Field Guide to Birds, Mammals, Reptiles, and Amphibians (Princeton University Press (WILDGuides)) George Mayfield Ecuador August 17, 2017