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- All Subjects: Butterfly
- All Subjects: Hayden, Carl Trumbull, 1877-1972
- All Subjects: Desert conservation
Letter from Carl Hayden to Robert Fechner on building a Union Chapel in the Grand Canyon.
Letter from Robert Fechner to Carl Hayden on building a Union Chapel in the Grand Canyon.
Letter from Arno B. Cammerer to Carl Hayden on building a Union Chapel in the Grand Canyon.
Letter from Carl Hayden to Walter Mitchell on building a Union Chapel in the Grand Canyon.
Letter from Walter Mitchell to Carl Hayden on building a Union Chapel in the Grand Canyon.
Letter from M. J. Riordan to Carl Hayden expressing his opposition to the federal government's takeover of Bright Angel Trail.
Letter from Carl Hayden to M. J. Riordan expressing his support for Coconino County in turning over the Bright Angel Trail to the federal government.
Letter from Horace M. Albright to Carl Hayden requesting a formal submission from Coconino County concerning the Bright Angel Trail.
Letter from Carl Hayden to Stephen Mather regarding Coconino County's willingness to dispose of Bright Angel Trail as long as the funds acquired would go to building a road between Old Trails Highway at Maine to the Grand Canyon.
Letter from F. R. Goodman to Carl Hayden expressing Coconino County's interest in handing over Bright Angel Trail to the government provided a sufficient amount of money is appropriated to build a road from Maine to the Grand Canyon.