Filtering by
- All Subjects: Hayden, Carl Trumbull, 1877-1972
- All Subjects: Desert conservation
- Creators: Dickinson, Alf
- Creators: Douglas, R. Douglas
- Creators: O'Reilly, L. J.
Letter from L. J. O'Reilly to Carl Hayden on behalf of William Randolph Hearst regarding his land ownership within the proposed Grand Canyon boundaries.
Letter from Alf Dickenson to Carl T. Hayden about securing mining permits within the park.
Mr. Proudfoot, the leading pygmy-owl biologist in the United States, has worked for the last two years to gather and analyze the data that allows us to address issues regarding the genetic viability of ferruginous pygmy-owls in Arizona and to establish a framework for future management efforts. The two major questions addressed are (1) do populations of concern lack genetic variation relative to putative healthy populations, and (2) how unique are geographically distinct populations within a species of special concern?