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  1. Catalogue of the flora of Montana and the Yellowstone National Park.
    By: Rydberg, Per Axel,
    Publication info: New York1900
    Contributed by: Robarts - University of Toronto (archive.org)
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  2. Catalogue of the flora of Montana and the Yellowstone National Park.
    By: Rydberg, Per Axel,
    Publication info: New York,1900.
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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  3. Contributions to the botany of the Yukon Territory, by Marshall A. Howe [and ohters]
    By: Britton, Nathaniel Lord, - Howe, Marshall A. - Rydberg, Per Axel, - Underwood, Lucien Marcus, - Williams, R. S.
    Publication info: New York,1901
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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  4. Flora of Colorado,
    By: Rydberg, Per Axel,
    Publication info: Fort Collins, Col.,Experiment Station,1906.
    Contributed by: Cornell University Library
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  5. Flora of Colorado, by P. A. Rydberg, PH. D.
    By: Rydberg, Per Axel,
    Publication info: Fort Collins, Col.,Experiment Station,1906.
    Contributed by: University of California Libraries (archive.org)
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  6. Flora of Colorado, by P.A. Rydberg.
    By: Rydberg, Per Axel,
    Publication info: Fort Collins, Col.,Experiment Station,1906.
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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  7. Flora of Colorado, by P.A. Rydberg.
    By: Rydberg, Per Axel,
    Publication info: Fort Collins, Col.,Experiment Station,1906.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Institution Libraries
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  8. Flora of the Black Hills of South Dakota. By P.A. Rydberg.
    By: Rydberg, Per Axel,
    Publication info: Washington,Govt. Print. Off.,1896.
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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  9. 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 / by P. A. Rydberg.
    By: Rydberg, Per Axel,
    Publication info: New York :Rydberg,1917.
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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  10. 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 /by P. A. Rydberg...
    By: Rydberg, Per Axel,
    Publication info: New York : The author, 1917.
    Contributed by: Missouri Botanical Garden, Peter H. Raven Library
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  11. 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 / by P.A. Rydberg.
    By: Rydberg, Per Axel,
    Edition: 2nd ed. --
    Publication info: New York :The author,1922.
    Contributed by: Gerstein - University of Toronto (archive.org)
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  12. 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, by P.A. Rydberg ...
    By: Rydberg, Per Axel,
    Edition: 2d ed.
    Publication info: New York,The author,1922.
    Contributed by: MBLWHOI Library, Woods Hole
    BHL Collections: MBLWHOI Library, Woods Hole
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  13. Flora of the southeastern United States; being descriptions of the seed-plants, ferns and fern-allies growing naturally in North Carolina, South Carolin, Georgia, Florida, Tennessee, Alabama, Mississippi, Arkansas, Louisiana and the Indian t by John Kunkel Small ...
    By: Small, John Kunkel, - Rydberg, Per Axel,
    Publication info: New York,The author,1903.
    Contributed by: University of California Libraries (archive.org)
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  14. Flora of the southeastern United States; being descriptions of the seed-plants, ferns and fern-allies growing naturally in North Carolina, South Carolina, Georgia, Florida, Tennessee, Alabama, Mississippi, Arkansas, Louisiana, and in Oklahom by John Kunkel Small.
    By: Small, John Kunkel, - Rydberg, Per Axel,
    Edition: 2d ed.
    Publication info: New York,The author,1913.
    Contributed by: University of California Libraries (archive.org)
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  15. Flora of the southeastern United States; being descriptions of the seed-plants, ferns and fern-allies growing naturally in North Carolina, South Carolina, Georgia, Florida, Tennessee, Alabama, Mississippi, Arkansas, Louisiana, and in Oklahom by John Kunkel Small.
    By: Small, John Kunkel, - Rydberg, Per Axel,
    Edition: 2d ed.
    Publication info: New York,The author,1913.
    Contributed by: MBLWHOI Library, Woods Hole
    BHL Collections: MBLWHOI Library, Woods Hole
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  16. Flora of the southeastern United States;being descriptions of the seed-plants, ferns and fern-allies growing naturally in North Carolina, South Carolin, Georgia, Florida, Tennessee, Alabama, Mississippi, Arkansas, Louisiana and the Indian territory and in Oklahoma and Texas east of the one-hundredth meridian /by John Kunkel Small ...
    By: Small, John Kunkel, - Rydberg, Per Axel,
    Publication info: New York : The author, 1903.
    Contributed by: Missouri Botanical Garden, Peter H. Raven Library
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  17. Key to the Rocky Mountain flora. Colorado, Utah, Wyoming, Idaho, Montana, Saskatchewan, Alberta, and parts of Nebraska, South Dakota, North Dakota, and British Columbia.
    By: Rydberg, Per Axel,
    Publication info: New York,[c1919]
    Contributed by: Cornell University Library
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  18. Key to the Rocky Mountain flora; Colorado, Utah, Wyoming, Idaho, Montana, Saskatchewan, Alberta, and parts of Nebraska, South Dakota, North Dakota, and British Columbia.
    By: Rydberg, Per Axel,
    Publication info: New York,1919.
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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  19. A monograph of the North American Potentilleae.
    By: Rydberg, Per Axel,
    Publication info: [Lancaster, Pa.,Press of the New Era Print. Co.]1898.
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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  20. Studies on Rocky Mountain flora.
    By: Rydberg, Per Axel,
    Publication info: New York,New York Botanical Garden,1899-1913.
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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