1. Fossil plants from the Tertiary lake beds of south-central Colorado Author/Creator: Knowlton, Frank Hall, 1860-1926, author Publication/Creation: [Washington] : [Department of the Interior, United States Geological Survey], [1923] Resource Type: Book Access & Availability: Loading
2. Revision of the flora of the Green River formation with descriptions of new species Author/Creator: Knowlton, Frank Hall, 1860-1926, author Publication/Creation: [Washington] : [Department of the Interior, United States Geological Survey], [1923] Resource Type: Book Access & Availability: Loading
3. A fossil flora from the Frontier Formation of southwestern Wyoming Author/Creator: Knowlton, Frank Hall, 1860-1926, author Publication/Creation: Washington : Department of the Interior, United States Geological Survey, 1917 Resource Type: Book Access & Availability: Loading
4. The flora of the Fox Hills sandstone Author/Creator: Knowlton, Frank Hall, 1860-1926, author Publication/Creation: [Washington] : [Department of the Interior, United States Geological Survey], [1917] Resource Type: Book Access & Availability: Loading
5. [Contributions to the geology and paleontology of San Juan County, New Mexico]. 4, Flora of the Fruitland and Kirtland formations Author/Creator: Knowlton, Frank Hall, 1860-1926, author Publication/Creation: [Washington] : [Department of the Interior, United States Geological Survey], [1917] Resource Type: Book Access & Availability: Loading