Endangered Species Act authorizations : hearings before the Subcommittee on Environmental Pollution of the Committee on Environment and Public Works, United States Senate, Ninety-ninth Congress, first session on S. 725, a bill to authorize appropriations to carry out the Endangered Species Act of 1973 during fiscal years 1986, 1987, 1988, 1989, and 1990, April 16 and 18, 1985