Over May, June & July 1974, the Representatives listed below would be the focus of lobbying, particularly by Canyon advocates, Havasupai & allies, dam lovers, and hunters.
Interior and Insular Affairs Committee*
House of Representatives, 93rd Congress 1973-5
Haley FL Chmn
Taylor NC Chmn, Parks Subc.
*Source: From my journal, supplemented by Wikipedia article on the 93rd Congress for some party affiliations and states.