Botanisches Zentralblatt; referierendes Organ für das Gesamtgebiet der Botanik - Association internationale des botanistes. (G. Fischer [etc.], 1906)

Bulletin - Colorado Agricultural Experiment Station (Colorado State University Experiment Station, 1905)

Bulletin of the Torrey Botanical Club - Torrey Botanical Club. (Torrey Botanical Club, 1906)

Contributions from the New York Botanical Garden - New York Botanical Garden (The Garden, 1906)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 1915)

Flora of Colorado - Rydberg, Per Axel, 1860 -1931 (Experiment Station, 1906)

Flora of Colorado - Rydberg, Per Axel, 1860 -1931 (Experiment Station, 1906)

Flora of Colorado - Rydberg, Per Axel, 1860 -1931 (Experiment Station, 1906)

Flora of Colorado - Rydberg, Per Axel, 1860 -1931 (Experiment Station, 1906)

Flora of New Mexico - Standley, Paul Carpenter, 1884 -1963 (G.P.O, 1915)

Flora of New Mexico. By E.O. Wooton and Paul C. Standley - Standley, Paul Carpenter, 1884 -1963 (Govt. Print. Off, 1915)

Flowering plants and ferns of Arizona - Kearney, Thomas H. (Thomas Henry), 1874 -1956 (U.S. Dept. of Agriculture, 1942)

Index Kewensis plantarum phanerogamarum. nomina et synonyma omnium generum et specierum ab initio anni MDCCCCXI usque ad finem anni MDCCCCXV complectens Supplementum quintum - Royal Botanic Gardens, Kew. (e prelo Clarendoniano)

Just's Botanischer Jahresbericht - Just, Johann Leopold, 1841 -1891 (Gebruder Borntraeger, 1910)

New manual of botany of the central Rocky mountains (vascular plants) - Coulter, John Merle, 1851 -1928 (American Book Company, 1909)

New manual of botany of the central Rocky Mountains, vascular plants - Coulter, John Merle, 1851 -1928 (American Book Co, 1909)

New manual of botany of the central Rocky mountains (vascular plants) - Coulter, John Merle, 1851 -1928 (American book company, 1909)

Repertorium specierum novarum regni vegetabilis (Selbstverlag des Herausgebers, 1910)

Repertorium specierum novarum regni vegetabilis (Selbstverlag des Herausgebers, 1910)

Repertorium specierum novarum regni vegetabilis (Selbstverlag des Herausgebers, 1905)

Studies on Rocky Mountain flora - Rydberg, Per Axel, 1860 -1931 (New York Botanical Garden, 1906)