by Ken G. Purdy, Gary R. Goff, Daniel J. Decker, Gerri A. Pomerantz, Nancy A. Connelly ; performed for Office of Information Transfer, Research and Development, U.S. Fish and Wildlife Service
"This study was conducted in cooperation with New York Cooperative Fish and Wildlife Research Unit, U.S. Fish and Wildlife Service, Cornell University."
Includes bibliographical references (pages 37-41).