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- All Subjects: Hayden, Carl Trumbull, 1877-1972
Letter to Carl T. Hayden regarding a water-power bill in effect for the Grand Canyon.
Letter from John H. Page to Carl T. Hayden regarding his company's rights to build a railway if they choose to.
Letter from Stephen T. Mather to Carl Hayden with markup of bill S 390 for the proposed National Park.
Letter from Carl Hayden to George W. P. Hunt outlining the proposed national park boundaries and the cost of a township if the state of Arizona decided to acquire one on the rim of the Grand Canyon.
Letter from W. W. Bass to Harry Welch protesting the proposed national park bill.
Letter from Harry Welch to Carl Hayden enclosing W. W. Bass' letter of protest against the proposed national park bill.
Letter from Carl Hayden to L. B. Williams concerning the proposed township in the Grand Canyon.
Letter from L. B. Williams to Carl Hayden regarding W. W. Bass' resistance to the park bill.
Letter from George Otis Smith to Carl Hayden regarding mining rights in the Grand Canyon.
Letter from Carl Hayden to George Otis Smith asking his advice regarding the mining of asbestos deposits in the Grand Canyon.