There has never been a very detailed map of existing vegetation types of Texas statewide on a plant association level. Important broad and/or regional studies include those by Bray (1906); Tharp (1926, 1939); Cottle (1931); Dyksterhuis (1946, 1948); Allred, et al. (1954); Gould et al. (1960) and a map by Telfair (1983). Kuchler (1964) published a potential natural vegetation type map of the conterminous