Letter from Carl Hayden to George Otis Smith asking his advice regarding the mining of asbestos deposits in the Grand Canyon.

Letter from Carl T. Hayden to Alf Dickenson about mine locations within the park.

Letter from Carl T. Hayden to Louis C. Cramton about potential prosecution of people with mining claims within park boundaries.

Photograph of inscriptions on a retaining wall at Cosanti in Paradise Valley, Arizona

Photograph of inscriptions on a retaining wall at Cosanti in Paradise Valley, Arizona

Photograph of inscriptions on a retaining wall at Cosanti in Paradise Valley, Arizona

Interior photograph of dome house in Cave Creek, Arizona, designed by Paolo Soleri, showing Paolo Soleri and Colly Soleri

Interior photograph of dome house in Cave Creek, Arizona, designed by Paolo Soleri, showing Paolo Soleri and Colly Soleri