Several reference guides are of major importance for the study of the post-1900 American West. The standard bibliography, although somewhat dated, is Richard W. Etulain et al., eds., The American West in the Twentieth Century: A Bibliography (Norman: University of Oklahoma Press, 1994), which lists more than eight thousand items. An earlier annotated listing is Dwight L. Smith, ed., The American and Canadian West: A Bibliography (Santa Barbara CA: ABC-Clio, 1979). The best index of new publications on the region is the listing of recent articles on the West carried in each quarterly issue of the Western Historical Quarterly, supplemented by that journal's annual July listing of recent dissertations and by the book review section carried in each of its issues. Also see the quarterly review sections in such other leading regional journals as Pacific Historical Review, Pacific Northwest Quarterly, Southwestern Historical Quarterly, and Montana: The Magazine of Western History. From 1990 to 2002 the Center for the American West (now the Center for the Southwest) at the University of New Mexico published bibliographies listing five hundred or more items on several western topics. Among these bibliographies are listings of women and families, Mexican Americans, African Americans, Indians, Asians, the environment, religion, the-
These chapter-by-chapter essays indicate those books and articles that we have found to be most important and valuable to understanding the subjects covered In The Ameritan West. The essays are nor meant to be exhaustive bibliographies. In teeth-century western history have simply not yet been systematically studied by scholars in the field.