National Wildlife Refuge System : hearings before the Subcommittee on the Environment of the Committee on Commerce, United States Senate, Ninety-fourth Congress, first session on S. 1268, to establish congressional policy directions for the administration and management of the National Wildlife Refuge System; to establish the "National Wildlife Refuge Service"; to provide authority for study, review, and establishment of additional units of the National Wildlife Refuge System, and for other purposes : H.R. 5608, to extend until the close of 1983 the period in which appropriations are authorized to be appropriated for the acquisition of wetlands, to increase the maximum amount of such authorization, and for other purposes, September 22 and October 3, 1975