The Northern Rockies Ecosystem Protection Act of 1993 : hearing before the Subcommittee on National Parks, Forests, and Public Lands of the Committee on Natural Resources, House of Representatives, One Hundred Third Congress, second session, on H.R. 2638, a bill to designate certain public lands in the states of Idaho, Montana, Oregon, Washington, and Wyoming as wilderness, wild and scenic rivers, national park and preserve study areas, wild land recovery areas, and biological connecting corridors, and for other purposes, April 12, 1994--Washington, DC.