BIG BEND The Impact of Human Use Upon the Chisos Basin and Adjacent Lands NPS Scientific Monograph No. 4

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AXELROD, D. I. 1950. Evolution of desert vegetation in Western North America. In D. I. Axelrod: Studies in late Tertiary paleobotany. Carnegie Inst. Washington Publ. 590:1-323.

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BOUYOUCOS, G. J. 1936. Direction for making mechanical analysis of soils by the hydrometer method. Soil Sci. 42:225-229.

CARROLL, J. A. n. d. The Big Bend Country: a regional history. Typescript. (Big Bend National Park files).

CARTER, W. T. 1931. The soils of Texas. Texas Agr. Exp. Stat. Bull. No. 431. 189 p.

CASEY. C. B. 1948. The Big Bend National Park. Sul Ross State Teachers Call. Bull. 28:30-40.

______. 1968. Ranching in the Big Bend. Typescript. (Big Bend National Park files.)

COTTLE. H. J. 1931. Studies in the vegetation of southwestern Texas. Ecology 12:105-155.

GEHLBACH, F. R. 1966. Plant formation in the natural history interpretation of southwestern desert regions. Natl. Parks Mag. 40:16-18.

GOULD, F. W. 1969. Texas plants: a check list and ecological summary. MP-585/revised. Texas Agric. Exp. Stat., College Station, Texas. 121 p.

HASTINGS, J. R., and R. M. TURNER. 1965. The changing mile: an ecological study of vegetation change with time in the lower mile of an arid and semiarid region. Univ. of Arizona Press. Tucson. Arizona. 317 p.

JACKSON. M. L. 1958. Soil chemical analysis. Prentice-Hall, Inc. Englewood Cliffs, N.J. 498 p.

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MARTIN. P. S. 1963. The last 10,000 years: a fossil pollen record of the American Southwest. Univ. of Arizona Press, Tucson, Arizona. 87 p.

MAXWELL. R. A. 1944. Memorandum for the Regional Director, Region Three. (Big Bend National Park files.)

______. 1947. Letter to W. P. Taylor. (Big Bend National Park files.)

______. 1968. The Big Bend of the Rio Grande. Bureau of Economic Geology, Guidebook 7, Univ. at Texas, Austin, Texas. 138 p.

______, J. T. LONSDALE, R. T. HAZZARD, and J. A. WILSON. 1967. The geology of Big Bend National Park, Brewster County, Texas. Univ. at Texas Pub. 6711. 320 p.

MCDOUGGAL, W. B. 1953. Memorandum to Acting Regional Director. 8 p. (Big Bend National Park files.)

PIPER, C. S. 1942. Soil and plant analysis. The Univ. of Adelaide. Adelaide, Australia. 368 p.

RAHT, C. G. 1963. The romance of the Davis Mountains and Big Bend Country. Edition Texana. The Rahtbooks Company, Odessa, Texas. 381 p.

SANKHLA, N., D. BAXI, and U. N. CHATTERJI. 1965. Eco-physiological studies on arid zone plants. I. Phytotoxic effects of aqueous extract of mesquite, Prosopis juliflora DC. Current Sci. 34:612-614.

SCHULMAN, E. 1952. Dendrochronology in Big Bend National Park, Texas. Tree-Ring Bull. 18:18-27.

SHELTON, W. R., and H. J. HARPER. 1941. A rapid method for the determination of total phosphorus in soil and plant material. Iowa State Coll. J. Sci. 15:408-413.

SHINNERS, L. H. 1948. Geographic limits of some alien weeds in Texas. Texas Geogr. Mag. Southern Methodist University, Dallas, Texas.

SHREVE, F. and A. L. HINCKLEY, 1937. Thirty years of change in desert vegetation. Ecology 18:463-478.

SPERRY, O. E., J. W. DOLLAHITE. G. O. HOFFMAN. and B. J. CAMP. 1963. Texas plants poisonous to livestock. B-1028. Texas Agri. Exp. Stat., Texas A. & M. University. 57 p.

U.S. DEPT. OF COMMERCE. 1968. Climatological Summary: Chisos Basin, Texas. Bureau of Business Research, Univ. of Texas, Austin, Texas.

WARNOCK, B. H. 1967. A photographic study to help determine the original vegetation of the Big Bend National Park, Texas. Photographs and typescript. (Big Bend National Park files.)

WELLS. P. V. 1965. Vegetation of the Dead Horse Mountains, Brewster County, Texas. Southwest. Nat. 10:256-260.

______. 1966. Late Pleistocene vegetation and degree of pluvial climatic change in the Chihuahuan Desert. Science 15:970-975.

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WHITSON, P. D. 1965a. Phytocoenology of Boot Canyon woodland, Chisos Mountains, Big Bend National Park, Texas. Unpubl. Thesis, Baylor Univ., Waco, Texas. 45 p.

______. 1965b. Phytocoenology of Boot Canyon woodland, Chisos Mountains, Big Bend National Park, Texas: permanent plot supplement. 12 p.

______. 1970. Dynamics of the Shrub Desert Formation—Succulent Desert Formation transition in Big Bend National Park, Texas. Unpubl. Dissertation, Univ. of Oklahoma, Norman. 104 p.