Horticulture - Pennsylvania Horticultural Society. (Horticulture Pub. Co, 1911)

Horticulture - Pennsylvania Horticultural Society. (Horticulture Pub. Co, 1913)

Horticulture - Pennsylvania Horticultural Society. (Horticulture Pub. Co, 1915)

Horticulture - Pennsylvania Horticultural Society. (Horticulture Pub. Co, 1917)

Horticulture - Pennsylvania Horticultural Society. (Horticulture Pub. Co, 1919)

House & garden (Condé Nast Publications, etc.], 1907)

Howard E. Gates famous cactus gardens : 1936 descriptive price list - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Howard E. Gates, 1936)

Hunt's perfection seeds : 1925 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (William M. Hunt & Company, Incorporated, 1925)

Iheringia. Série zoologia - Fundação Zoobotânica do Rio Grande do Sul. Museu de Ciências Naturais. (Museu Rio-Grandense de Ciências Naturais, Divisão de Ciências do Departamento de Ciência e Cultura, Secretaria de Estado dos Negócios da Educação e Cultura do Govêrno do Estado do Rio Grande do Sul, 1967)

Iheringia. Série zoologia - Fundação Zoobotânica do Rio Grande do Sul. Museu de Ciências Naturais. (Museu Rio-Grandense de Ciências Naturais, Divisão de Ciências do Departamento de Ciência e Cultura, Secretaria de Estado dos Negócios da Educação e Cultura do Govêrno do Estado do Rio Grande do Sul, 1993)

Illinois biological monographs - University of Illinois at Urbana-Champaign. (Univ. of Illinois Press, 1954)

Illinois biological monographs - University of Illinois at Urbana-Champaign. (Univ. of Illinois Press, 1957)

Illinois biological monographs - University of Illinois at Urbana-Champaign. (Univ. of Illinois Press, 1978)

An illustrated flora of the Pacific States: Washington, Oregon, and California - Abrams, Le Roy, 1874 -1956 (Stanford University Press, 1951)

Illustrations of West American oaks. From drawings by Albert Kellog; the text by Edward L. Greene. Published from funds provided by James M. McDonald - Greene, Edward Lee, 1843 -1915 ([Printed by Bosqui Engraving and Print. Co.], 1889)

Important western browse plants - Dayton, William A. (William Adams), 1885 - (U.S. Dept. of Agriculture, 1931)