This scientific work by Charles C. Parry provides a thorough description of the physiography and flora of a specific region of the Rocky Mountains. Asa Gray, a noted botanist and Parry's mentor, provides a detailed enumeration of the plants found in the area during Parry's survey in 1861. The book is a valuable resource for anyone interested in the natural history of the American West.

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.

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