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- All Subjects: Grand Canyon National Park (Ariz.)
- Creators: Cameron, Ralph H.
- Creators: Leedshill-Herkenhoff, Inc.
- Creators: Ringland, Arthur
Letter from Ralph H. Cameron to Carl Hayden thanking him for forwarding Senate Bill No. 390 with the report of March 31st, 1918, and expressing interest in their upcoming meeting in Washington.
Letter from Ralph H. Cameron to Carl Hayden requesting a delay on the introduction of the Grand Canyon bill until he can meet with himself and Senator Ashurst in Washington.
Letter from Ralph H. Cameron asking to speak to Carl Hayden concerning a matter relevant to the bill granting National Park status to the Grand Canyon.
Letter from Arthur Ringland to Carl Hayden about road alignment survey through the Buggeln ranch.
Grand Canyon National Park airport master plan, final report: inventory, aviation forecasts, demand/capacity analysis, airport requirements, airport plans, financial plan environmental review.