At-Sea Distribution and Abundance of Seabirds off Southern California: A 20-Year Comparison .— John W. Mason , Gerard J. McChesney , William R. McIver , Harry R. Carter , John Y. Takekawa , Richard T. Golightly , Joshua T. Ackerman , Dennis L. Orthmeyer , William M. Perry , Julie L. Yee , Mark O. Pierson , and Michael D. McCrary . 2007. Studies in Avian Biology no. 33. Cooper Ornithological Society, Camarillo, California. ix + 101 pp., 45 figures, 17 tables. ISBN: 9780943610726. Paper, $15