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  1. Asa Gray correspondence. Senders Ro-Ry,
    By: Gray, Asa, - Kolderup-Rosenvinge, J. L. A. (Janus Lauritz Andreas), - Robb, James, - Robbins, James Watson, - Robeson, Andrew, - Robinson, Benjamin Lincoln, - Robinson, John, - Robinson, W. (William), - Rodgers, John, - Rogers, William Barton, - Rolleston, George, - Rolleston, Grace, - Romanes, George John, - Rood, Ogden N. (Ogden Nicholas), - Röper, Johannes August Christian, - Rose, J N (Joseph Nelson) - Rothery, H. C. (Henry Cadogan), - Rothrock, Joseph T., - Roumeguère, Casimir, - Royle, J. Forbes (John Forbes), - Rugel, Ferdinand Ignatius Xavier, - Ruprecht, F. - Rusby, Henry Hurd, - Russell, John Lewis, - Rust, Mary Olivia, - Rydberg, Per Axel,
    Holding Institution: Harvard University Botany Libraries
    BHL Collections: Harvard University Herbarium, Botany Libraries
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  2. Catalogue of the flora of Montana and the Yellowstone National Park.
    By: Rydberg, Per Axel,
    Publication info: New York1900
    Holding Institution: University of Toronto - Robarts Library
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  3. Catalogue of the flora of Montana and the Yellowstone National Park.
    By: Rydberg, Per Axel,
    Publication info: New York,1900.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
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  4. 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
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
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  5. Flora of Colorado,
    By: Rydberg, Per Axel,
    Publication info: Fort Collins, Col.,Experiment Station,1906.
    Holding Institution: Cornell University Library
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  6. Flora of Colorado, by P. A. Rydberg, PH. D.
    By: Rydberg, Per Axel,
    Publication info: Fort Collins, Col.,Experiment Station,1906.
    Holding Institution: University of California Libraries (archive.org)
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  7. Flora of Colorado, by P.A. Rydberg.
    By: Rydberg, Per Axel,
    Publication info: Fort Collins, Col.,Experiment Station,1906.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
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  8. Flora of Colorado, by P.A. Rydberg.
    By: Rydberg, Per Axel,
    Publication info: Fort Collins, Col.,Experiment Station,1906.
    Holding Institution: Smithsonian Libraries
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  9. Flora of the Black Hills of South Dakota. By P.A. Rydberg.
    By: Rydberg, Per Axel,
    Publication info: Washington,Govt. Print. Off.,1896.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    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, North Dakota, and British Columbia / by P. A. Rydberg.
    By: Rydberg, Per Axel,
    Publication info: New York :Rydberg,1917.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
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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: Rydberg, Per Axel,
    Edition: 2nd ed. --
    Publication info: New York :The author,1922.
    Holding Institution: University of Toronto - Gerstein Science Information Centre
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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, and British Columbia /by P. A. Rydberg...
    By: Rydberg, Per Axel,
    Publication info: New York : The author, 1917.
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
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  13. 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.
    Holding Institution: University of California Libraries (archive.org)
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  14. 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.
    Holding Institution: MBLWHOI Library
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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 Oklahoma and Texas east of the one hundredth meridian,
    By: Small, John Kunkel, - Rydberg, Per Axel,
    Edition: 2d ed.
    Publication info: New York,The author,1913.
    Holding Institution: Wellesley College Library (archive.org)
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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 Carolina, Georgia, Florida, Tennessee, Alabama, Mississippi, Arkansas, Louisiana, and in Oklahoma and Texas east of the one hundredth meridian,
    By: Small, John Kunkel, - Rydberg, Per Axel,
    Edition: 2d ed.
    Publication info: New York,The author,1913.
    Holding Institution: Multiple institutions
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  17. 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: Small, John Kunkel, - Rydberg, Per Axel,
    Publication info: New York :The author,1903.
    Holding Institution: Multiple institutions
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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,[c1919]
    Holding Institution: Cornell University Library
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  19. 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.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
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  20. A monograph of the North American Potentilleae.
    By: Rydberg, Per Axel,
    Publication info: [Lancaster, Pa.,New Era Printing Co.]1898.
    Holding Institution: Cornell University Library
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  21. A monograph of the North American Potentilleae.
    By: Rydberg, Per Axel,
    Publication info: [Lancaster, Pa.,Press of the New Era Print. Co.]1898.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
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  22. The North American species of Physalis and related genera /
    By: Rydberg, Per Axel,
    Publication info: New York :Torrey Botanical Club,1896.
    Holding Institution: Wellesley College Library (archive.org)
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  23. Studies on Rocky Mountain flora.
    By: Rydberg, Per Axel,
    Publication info: New York,New York Botanical Garden,1899-1913.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
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