Interior Department.- Salinity problems, 1964

The Carl T. Hayden Papers consist of personal and political correspondence, newsclippings, speeches, legislation, congressional and senatorial files, research notes, printed matter and memorabilia dating from 1851 to 1979. The bulk of the collection documents Hayden's activities as an United States Senator from Arizona from 1940 to 1968.

The files collected by Dr. Ross Rice and recovered from Hayden's office (boxes 720-815) generally consist of personal correspondence and research files showing Hayden's post-congressional activities and interest in Arizona pioneer history. These files date from 1851 to 1972.

Of particular interest in Series XX: Correspondence are the yellow copies of Hayden's outgoing correspondence (1949-1968, Boxes 206-247), which are filed first by year and then alphabetically by incoming correspondent. Given the year an incoming letter was written and the name of the author it is possible to locate the original incoming correspondence filed in Hayden's subject files through markings in the margins of the yellow copies of outgoing correspondence.