The Badland formations of the Black Hills region - O'Harra, Cleophas C. 1866 -1935 ([The Daily Journal], 1910)

Cenozoic mammal horizons of western North America - Osborn, Henry Fairfield, 1857 -1935 (Govt. Print. Off, 1909)

Index of mosses : a catalog of the names and citations for new taxa, combinations, and names for mosses published during the years 1963 through 1989 with citations of previously published basionyms and replaced names, together with lists of the names of authors of the names and lists of names of publications used in the citations - Magill, Robert E. (Missouri Botanical Garden, 1992)

LATMOSS, a catalogue of neotropical mosses - Cárdenas S., Ángeles, 1949 - (Missouri Botanical Garden, 1995)

Moss flora of Central America - Crum, Howard, 1922 -2002 (Missouri Botanical Garden, 2010)

New species of Xanthium and Solidago - Millspaugh, Charles Frederick, 1854 -1923 (1918)

Publication. Field Museum of Natural History Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1927)

Publication. Field Museum of Natural History Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1927)

Publication. Field Museum of Natural History Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1927)

Publication. Field Museum of Natural History Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1929)

Revision of the North American species of Xanthium - Millspaugh, Charles Frederick, 1854 -1923 (1919)

The White River Badlands - O'Harra, Cleophas C. 1866 -1935 (1920)