Rivista di patologia vegetale - Istituto di patologia vegetale (Università di Milano) (Tipografia del Seminario, 1912)

Rivista di patologia vegetale - Istituto di patologia vegetale (Università di Milano) (Tipografia del Seminario, 1913)

Rivista di patologia vegetale - Istituto di patologia vegetale (Università di Milano) (Tipografia del Seminario, 1915)

Rivista di patologia vegetale - Istituto di patologia vegetale (Università di Milano) (Tipografia del Seminario, 1916)

Rivista di patologia vegetale - Istituto di patologia vegetale (Università di Milano) (Tipografia del Seminario, 1917)

Rivista di patologia vegetale - Istituto di patologia vegetale (Università di Milano) (Tipografia del Seminario, 1920)

Rivista di patologia vegetale - Istituto di patologia vegetale (Università di Milano) (Tipografia del Seminario, 1923)

Robson quality seeds 1951 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Robson Seed Farms, 1951)

Robson quality seeds 1952 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Robson Seed Farms, 1952)

Robson seeds, 1947 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Robson Seed Farms, 1947)

Robt. S. Griswold's '48 garden annual - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Robt. S. Griswold Seed & Floral Co, 1948)

The Rocky Mountain Seed Co. 1939 vegetable and field flower seeds catalog - Rocky Mountain Seed Company. (Rocky Mountain Seed Co, 1939)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 1937)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 1941)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 1982)

Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 2000)

The romance of everifarm - Sconce, Harvey J. (Macmillan, 1922)

Romance of low life amongst plants : facts and phenomena of cryptogamic vegetation - Cooke, M. C. (Mordecai Cubitt), 1825 -1914 (Society for Promoting Christian Knowledge, 1893)

Roosevelt wild life bulletin ... of the Roosevelt Life Forest Experiment Station of the New York College of Forestry at Syracuse University - New York State College of Forestry at Syracuse University. Roosevelt Wild Life Forest Experiment Station. (The University, 1921)

Roosevelt wild life bulletin ... of the Roosevelt Life Forest Experiment Station of the New York College of Forestry at Syracuse University - New York State College of Forestry at Syracuse University. Roosevelt Wild Life Forest Experiment Station. (The University, 1923)

Root characteristics of some important trees of eastern forests : a summary of the literature - United States. Forest Service. Eastern Region. (Eastern Region, Forest Service, U.S. Dept. of Agriculture, 1980)

Root development of field crops - Weaver, John E. (John Ernest),‏ ‎ 1884 -1966 (McGraw-Hill book company, inc, 1926)

Root development of vegetable crops - Weaver, John E. (John Ernest),‏ ‎ 1884 -1966 (McGraw-Hill book company, inc, 1927)

Root-rot control and soil improvement at the Ashe forest nursery - United States. Department of Agriculture. (Southern Forest Experiment Station, 1951)

Rooting habits of selected commercial tree species of the eastern United States : a bibliography - Every, Leanne. (G.P.O, 1980)