Provides a general overview of the disease outbreaks reported Maricopa County, Arizona, and the subsequent investigations led by the Maricopa County Department of Public Health.

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.

Letter from Dwight B. Heard, president and publisher of The Arizona Republican, to Carl T. Hayden about a visit by Stephen Mather.