See T. H. Clark and C. W. Stearn, The Geological Evolution of North America (1968); W. P. Cumming et al., The Discovery of North America (1972); R. C. West et al., Middle America: Its Lands and Peoples (3d ed. 1989); T. L. McKnight, Regional Geography of the United States and Canada (1992); S. Birdsall, Regional Landscapes of the United States and Canada (4th rev. ed. 1992); T. Flannery, The Eternal Frontier: An Ecological History of North America and Its Peoples (2001); A. Taylor, American Colonies (2001).
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