Guberlet, Muriel L. _Animals of the Seashore._ 412 pp. Metropolitan
Press. Portland, Oregon, 1936. Illustrations and descriptions of 198
species. A handy reference on the seashore.
Kirk, Ruth. _The Olympic Seashore._ 79 pp. The Olympic Natural History
Assoc. Port Angeles, Wash., 1962. Guide to the human and natural
history of the seashore of Olympic National Park, with maps and
illustrations.
Ricketts, Edward F. and Calvin, Jack. _Between Pacific Tides._ 502 pp.
Stanford Univ. Press. Palo Alto, Calif., 1952. An account of the
habits and habitats of some 500 conspicuous seashore invertebrates.