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- All Subjects: Grand Canyon National Park (Ariz.)
- All Subjects: Desert conservation
- Creators: Breen, Fred S.
- Creators: Dutton, Clarence
- Creators: Kobetich, Gail
- Creators: Mathes, François E.
Letter from Fred Breen to Carl Hayden regarding the sale of Bright Angel Trail.
Geological examination of the park canyonland, with description of the rocks, water sculping process, volcanic cones and outflows, and land erosion. This edition is Volume 2, 1977 reprint, of the author's 1882 monograph. Includes 12 color maps, 10 color views and is number 280/1500.
Letter from François E. Mathes to Carl T. Hayden about maps of the Grand Canyon.
With the passage of the Federal Endangered Species Act in 1973, the stage was set for a confrontation between urban development and the provisions of Federal Law. Language was amended to the Act that established standards that a plan would have to meet before the Fish and Wildlife Service could approve it and issue a permit for the take of a listed species. In those jurisdictions that have adopted this approach, conservation of natural resources is no longer an afterthought but a major element that has to be considered during the regular land use permitting process.