Letter from Carl Hayden to Robert Fechner 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 Carl Hayden to Arno B. Cammerer on behalf of Jesse L. Boyce's complaint. Hayden states that Boyce believes Crosby's report to be inaccurate and an underestimation of the danger of the stored explosives.

Letter of introduction for Dwight B. Heard on the arrival of National Park Service Director Stephen T. Mather to Phoenix. Mather's visit includes trips to Roosevelt Dam and Tumacácori.