8 books • 1 series
Birds of Ecuador (Helm Field Guides)
Birds of Colombia (Helm Field Guides)
Birds of the Guianas (Helm Field Guides)
Birds of Venezuela (Helm Field Guides)
Birds of Trinidad and Tobago (Helm Field Guides)
Birds of Northern South America: An Identification Guide (Helm Field Guides)
Checklist of the Birds of Northern South America
Finches and Other Seed-eating Birds