2002. By Ann Squire, Ph D in animal science. 48 pages. Photographs. About shells and mollusks. Univalves vs bivalves. How shells grow. A few interesting features.
I recently read a stack of shell books for a children's art program I was doing at the library. This one was very informative. Univalves. Bivalves. The amazing nautilus. A good basic introduction to shells.