Map of proposed addition to Grand Canyon National Park Boundaries. Circa 1932.
- Proposed Boundaries Line of Addition to Grand Canyon National Park
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Senator Carl T. Hayden Papers (1851-1979). MSS 1. Greater Arizona Collection. ASU Library, Arizona State University, Tempe, AZ. http://azarchivesonline.org/xtf/view?docId=ead/asu/hayden.xml