Cvancara's Aquatic Mussels of North Dakota from 1983. He documented 13 species of what are generally referred to as clams in the state along with 13 species of pill clams, which are very small clams, in the order of a few millimeters in length. He also documented 22 species of snails in the state.
Cvancara's Aquatic Mussels of !North Dakota from 198.3. He documented 13 species of what are generally referred to as clams in the state along with 13 species of pill clams, which are very s!mall clams, in the order of a few millimeters in length. He also documented. 22 species of snails in the state.