Contribution to the knowledge of the morphological value and the phylogeny of the ovule and its integuments - Haan, Henri Rudolph Mari de. (De Waal, 1920)

Contributiones ad algologiam et fungologiam - Reinsch, Paul Friedrich, 1836 -1914 (T. O. Weigel, 1875)

Contributions à la flore fossile du Portugal - Heer, Oswald, 1809 -1883 (Imprimerie de l'Académie royale des sciences, 1881)

Contributions from the Botanical Laboratory - University of Pennsylvania. Botanical Laboratory. (University of Pennsylvania Press, 1892)

Contributions from the Botanical Laboratory of the University of Pennsylvania - University of Pennsylvania. Botanical Laboratory. (University of Pennsylvania Press, 1911)

Contributions from the Department of Botany of Columbia University - Columbia University. Department of Botany (s.n.], 1896)

Contributions from the Gray Herbarium of Harvard University - Harvard University. Gray Herbarium. (Harvard University, 1921)

Contributions from the Gray Herbarium of Harvard University - Harvard University. Gray Herbarium. (Harvard University, 1930)

Contributions from the Gray Herbarium of Harvard University - Harvard University. Gray Herbarium. (Harvard University, 1931)

Contributions from the Gray Herbarium of Harvard University - Harvard University. Gray Herbarium. (Harvard University, 1937)

Contributions from the Gray Herbarium of Harvard University - Harvard University. Gray Herbarium. (Harvard University, 1938)

Contributions from the Gray Herbarium of Harvard University - Harvard University. Gray Herbarium. (Harvard University, 1942)

Contributions from the Gray Herbarium of Harvard University - Harvard University. Gray Herbarium. (Harvard University, 1945)

Contributions from the Herbarium of Columbia College - Columbia College (New York, N.Y.). Herbarium. (Columbia College, 1886)

Contributions from the Hull Botanical Laboratory - Hull Botanical Laboratory. (University of Chicago Press, 1919)

Contributions from the New York Botanical Garden - New York Botanical Garden (The Garden, 1918)

Contributions from the Osborn Botanical Laboratory - Yale University. Osborn Botanical Laboratory (Osborn Botanical Laboratory, Yale University, 1916)

Contributions from the Osborn Botanical Laboratory - Yale University. Osborn Botanical Laboratory (Osborn Botanical Laboratory, Yale University, 1923)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 1897)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 1901)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 1903)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 1906)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 1919)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 1920)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 1931)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 2000)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 2003)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 2007)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 2011)

Contributions from the University of Michigan Herbarium - University of Michigan. University Herbarium. (University Herbarium, University of Michigan, 1972)

Contributions from the University of Michigan Herbarium - University of Michigan. University Herbarium. (University Herbarium, University of Michigan, 1997)

Contributions from the University of Michigan Herbarium - University of Michigan. University Herbarium. (University Herbarium, University of Michigan, 2001)

Contributions in science - Los Angeles County Museum of Natural History. (The Museum, 1964)

Contributions of the American Entomological Institute - American Entomological Institute. (American Entomological Institute], 1969)

Contributions to botany : iconographic and descriptive detailing the character of plants that are either new or imperfectly described, to which are added remarks on their affinities - Miers, John, 1789 -1879 (Williams and Norgate, 1860)

Contributions to Canadian botany - Macoun, James Melville, 1862 -1920 (s.n, 1895)

Contributions to Canadian botany - Macoun, James Melville, 1862 -1920 ([s. n.], 1894)

Contributions to the botany of Vermont - Middlebury College. (Botanical Dept., University of Vermont, 1898)

Contributions to the fossil flora of the western territories ... - Lesquereux, Léo, 1806 -1889 (Govt. Print. Off, 1874)