Aerial survey as a technique for estimating trends in manatee population size - problems and prospects. In: T. J. O'Shea, B. B. Ackerman, & H. F. Percival (eds.), Population biology of the Florida manatee (q.v.).

Information & Technology Rept. (U.S. Dept. Interior, Natl. Biological Service) (vi + 289) 1: 63-74. 4 tabs. 3 figs. Aug. 1995.