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  1. By: Ricker, Percy Leroy,
    Publication info: [Place of publication not identified], [publisher not identified], [1924?]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Collins, J. Franklin (James Franklin), - Gould, John Mead, - Hammond, Charles C., - Manning, P. C. (Prentice C.), - Perry, Elizabeth, - Peterson, Stella Freeman, - Piguet, Adolphe Pierre David, - Pinchot, Gifford, - Poland, William Carey, - Pollard, Charles Louis, - Porter, Alice F., - Powers, William L., - Preston, Howard W. - Priest, Irwin Gillespie, - Pringle, Cyrus G. (Cyrus Guernsey), - Pyle, Harry L. - Rand, Edward L. (Edward Lothrop), - Rau, Eugene A. (Eugene Abraham), - Regester, Charles A., - Rice, Howard M., - Rich, William Penn, - Richardson, J. H., - Richardson, Oliver H. (Oliver Huntington), - Ricker, Percy Leroy, - Riddle, Lincoln Ware, - Ripley, Winfield Scott, Jr., - Robinson, Benjamin Lincoln, - Rugg, Harold Goddard, - Sandberg, John Herman, - Seaton, H. E. (Henry Eliason), - St. John, Harold, - Thompson, Joseph Porter,
    Holding Institution: Harvard University Botany Libraries
  3. By: Ricker, Percy Leroy,
    Publication info: Washington, 1945
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    BHL Collections: Seed & Nursery Catalogs
  4. By: Ricker, Percy Leroy,
    Publication info: Orono, Me, 1902
    Holding Institution: University of California Libraries
  5. By: Farlow, W. G. (William Gilson), - Renauld, Ferdinand, - Richards, Herbert M. (Herbert Maule), - Ricker, Percy Leroy, - Ricksecker, Alfred Edmund, - Riddle, Lincoln Ware, - Robinson, Benjamin Lincoln, - Robinson, Charles Budd, - Rusby, Henry Hurd, - Russell, H., Mrs.,
    Holding Institution: Harvard University Botany Libraries
    BHL Collections: BHL Field Notes Project
  1. By: Ricker, Percy Leroy,
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 21
    Date: 1908
    Page Range: 11--18
    Publication Info: Washington, Biological Society of Washington,
  2. By: Ricker, Percy Leroy,
    Type: List
    In: William Gilson Farlow miscellaneous specimen lists : collectors R
    Date: 1898
  3. By: Ricker, Percy Leroy,
    Type: Article
    In: Journal of the Washington Academy of Sciences
    Volume: 36
    Date: 1946
    Page Range: 37--40
    Publication Info: Washington [etc Washington Academy of Sciences]
  4. By: Ricker, Percy Leroy,
    Type: Article
    In: Rhodora
    Volume: 15
    Date: 1913
    Page Range: 96--97
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  5. By: Ricker, Percy Leroy,
    Type: Article
    In: Botanical gazette
    Volume: 55
    Issue: 6
    Date: 1913
    Page Range: 461--461
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991
  6. By: Ricker, Percy Leroy,
    Type: Article
    In: Torreya
    Volume: 13
    Issue: 5
    Date: 1913
    Page Range: 113--115
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  7. By: Ricker, Percy Leroy,
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 30
    Date: 1917
    Page Range: 17--18
    Publication Info: Washington, Biological Society of Washington,
  8. By: Ricker, Percy Leroy,
    Type: Article
    In: Rhodora
    Volume: 36
    Date: 1934
    Page Range: 130--2
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  9. By: Ricker, Percy Leroy,
    Type: Correspondence
    In: James Franklin Collins correspondence
    Date: 1917-02-17
  10. By: Ricker, Percy Leroy,
    Type: Article
    In: American journal of botany
    Volume: 3
    Issue: 8
    Date: 1916-10
    Page Range: 470--473
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-