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A flora of California - Jepson, Willis Linn, 1867 -1946 (Cunningham, Curtis & Welch, 1909)

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Flora of the Rocky Mountains and adjacent plains, Colorado, Utah, Wyoming, Idaho, Montana, Saskatchewan, Alberta, and neighboring parts of Nebraska, South Dakota, North Dakota, and British Columbia - Rydberg, Per Axel, 1860 -1931 (The author, 1922)

Flora of the Rocky Mountains and adjacent plains, Colorado, Utah, Wyoming, Idaho, Montana, Saskatchewan, Alberta, and neighboring parts of Nebraska, South Dakota, and British Columbia - Rydberg, Per Axel, 1860 -1931 (The author, 1917)

Flora of the Rocky Mountains and adjacent plains, Colorado, Utah, Wyoming, Idaho, Montana, Saskatchewan, Alberta, and neighboring parts of Nebraska, South Dakota, and British Columbia - Rydberg, Per Axel, 1860 -1931 (The author, 1917)

Flora of the Rocky Mountains and adjacent plains, Colorado, Utah, Wyoming, Idaho, Montana, Saskatchewan, Alberta, and neighboring parts of Nebraska, South Dakota, and British Columbia - Rydberg, Per Axel, 1860 -1931 (The author, 1917)

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An illustrated flora of the Pacific States: Washington, Oregon, and California - Abrams, Le Roy, 1874 -1956 (Stanford University Press, 1923)

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John Thomas Howell botanical collecting notebook - California Academy of Sciences. Department of Botany. (1940)

John Thomas Howell botanical collecting notebook - California Academy of Sciences. Department of Botany. (1941)

John Thomas Howell botanical collecting notebook - California Academy of Sciences. Department of Botany. (1942)

John Thomas Howell botanical collecting notebook - California Academy of Sciences. Department of Botany. (1942)

John Thomas Howell botanical collecting notebook - California Academy of Sciences. Department of Botany. (1942)

John Thomas Howell botanical collecting notebook - California Academy of Sciences. Department of Botany. (1942)

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Muhlenbergia - Heller, Amos Arthur, 1867 -1944 (1911)

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North American flora - New York Botanical Garden (New York Botanical Garden, 1931)

North American flora - New York Botanical Garden (New York Botanical Garden, 1935)