Conservation and the Environment Map Collections"The historic and more recent maps contained in this category show early exploration and subsequent land use in various areas of the United States. These maps show the changes in the landscape, including natural and man-made features, recreational and wilderness areas, geology, topography, wetland area, vegetation, and wildlife. Specific conservation projects such as the growth and development of U.S. National Parks are included in this category. " This excellent site is part of the Library of Congress Memory Project.