The Library of Congress provides this interesting resource describing the evolution of the conservation movement between 1850 and 1920. The Website documents "the historical formation and cultural foundations of the movement to conserve and protect America's natural heritage." Information provided here is based on hundreds of books, pamphlets, federal statutes, congressional resolutions, legislative documents, presidential proclamations, prints, photographs, historic manuscripts, and (one) motion picture. The conservation movement is chronicled roughly by two-decade periods (e.g., 1847-1871, 1872-1889, etc.), using key legislative events, public response and involvement, important publications, and other historic happenings. During each time period, certain events are highlighted -- with hyperlinks to each relevant document (or to a summary). For students interested in learning about the development and evolution of conservation in the United States, this is an excellent and well documented educational resource.