The Thoreau Institute at Walden Woods Library is a center for research and education focused on Henry David Thoreau, his literary achievements and philosophy, and his influence on environmental and social movements. It has the most comprehensive Thoreau research collection in the world.
If you run across a random article on the Internet, you need to ask at least two questions in order to determine if it is a scholarly source and therefore acceptable for an academic, or college-level, project:
Of course, there are times when non-scholarly web sites may be acceptable research sources, but for these it is especially important to determine their quality. For help in applying criteria to web sites, watch the following video The Research Process: Evaluating Websites produced by Pollak Library, California State University, Fullerton: