Austin Craig Apgar - Böcker

Mollusks of the Atlantic Caost of the United States, South to Cape Hatteras

Mollusks of the Atlantic Caost of the United States, South to Cape Hatteras

Pocket Key of the Birds of the Northern United States, East of the Rocky Mountains

Pocket Key of the Birds of the Northern United States, East of the Rocky Mountains

Key to the Mollusca

Verrill's Systematic Catalogue of the Invertebrates of Southern New England and the Adjacent Waters