Orr, A. J., A. S. Banks, S. Mellman, H. R. Huber, Robert L. DeLong, and Robin F. Brown. "Examination of the foraging habits of Pacific harbor seal (Phoca vitulina richardsi) to describe their use of the Umpqua River, Oregon, and their predation on salmonids." Fishery Bulletin 102 (2004): p.108-117.