1. R. J. Beach, A. C. Geiger, S. J. Jeffries, S. D. Treacy, and B. L. Troutman. 1985 . Marine mammals and their interactions with fisheries of the Columbia River and adjacent waters, 1980-1982 . NWAFC Processed Report 85-04, NMFS, NWAFC, Seattle, WA. 316 pp.
2. R. F. Brown, 1981 . Abundance, movements, and feeding habits of the harbor seal,Phoca vitulina, at Netarts Bay, Oregon . M.S. thesis , Oregon State University, Corvallis, OR. 69 pp.
3. G. Caughley, 1977 . Analysis of vertebrate populations . John Wiley and Sons, New York, NY. 234 pp.
4. Growth and Movements of a Known-Age Harbor Seal