To enlarge the Indiana Dunes National Lakeshore : hearing before the Subcommittee on National Parks and Recreation of the Committee on Interior and Insular Affairs, House of Representatives, Ninety-fourth Congress, first session on H.R. 789, H.R. 4926, and H.R. 5241, to amend the act establishing the Indiana Dunes National Lakeshore to provide for the expansion of the lakeshore, and for other purposes : hearing held in Washington, D.C., May 9, 1975