National Park’s list of “Useful Books”Links to an external site. about the parks — many with links to online copies of the books
National Park Service, Park HistoriesLinks to an external site.
This is an amazing resource assembled by the National Park Service. Arranged in a list of scores of parks, for each it provides documents and books about facets of the park’s history and environment. Here, for example, you can find Alfred Runte’s important history of Yosemite as well as the famous Olmsted Report on Yosemite.