Credit: Courtesy of The Academy of Natural Sciences, Ewell Sale Stewart Library
A Monograph of the Freshwater Univalve Mollusca of the United States was one of more than 200 publications across six separate disciplines that Samuel Haldeman produced before his death in 1880. This illustration is one of 39 colored plates drawn and illustrated by Philadelphian Helen Elizabeth Lawson, (1808-1853) one of the nation's finest scientific illustrators.
