Bruner, W. E. 1931. The vegetation of Oklahoma. Ecological Monographs 1: 100-188.
Osborn, B. and H. L. Whittaker. 1936. Legend for reconnassiance mapping of natural vegetation in the central Great Plains region. U. S. D. A. Soil Conservation Service, Region 7, Salina, Kansas. Biol. Leaflet Number 9.
Osborn, B. and H. L. Whittaker. 1937a. Chart of principal dominant species for determination of types and phases of natural vegetation in the central Great Plains region. U. S. D. A. Soil Conservation Service, Region 7, Salina, Kansas. Biol. Leaflet Number 10.
Osborn, B. and H. L. Whittaker. 1937b. Reconnassiance mapping of natural vegetation of the central Great Plains region. U. S. D. A. Soil Conservation Service, Region 7, Salina, Kansas. Biol. Leaflet Number 12.
Osborn, B. 1941. Biotic mapping of Oklahoma watersheds. Proceedings of the Oklahoma Academy of Science 23: 31-33.
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