Prehistoric Trackways Study Act of 1990 : hearing before the Subcommittee on Public Lands, National Parks, and Forests of the Committee on Energy and Natural Resources, United States Senate, One Hundred First Congress, second session, on S. 2684, to authorize a study of methods to protect and interpret the nationally significant fossil trackways found in the Robledo Mountains near Las Cruces, NM, Las Cruces, NM, July 6, 1990.