U

 

UDALL, Sharyn R. Contested Terrain: Myth and Meaning in Southwest Art (Albuquerque: University of New Mexico Press, 1996).

UDALL, Stewart. The Quiet Crisis. NewYork: Holt, Rinehart and Winston, 1963.

UNGER, Douglas. Leaving the Land. Lincoln: U of Nebraska P, 1995.

UPTON, Barbara Jean. "Towards an Environmental Ethic: A Whiteheadean Perspective." DAI 33 (December 1995).

URSCHEL, Linda K. "Emerson’s ‘The Snow-Storm.’" Explicator 50 (1991).

URTEAGA, L., La Tierra Esquilmada - Las Ideas sobre la Conservación de la Naturaleza en la Cultura Espanola del siglo XVIII, Barcelona, 1981