The Walden Woods Project preserves the land, literature and legacy of Henry David Thoreau to foster an ethic of environmental stewardship and social responsibility. The Project achieves this mission through the integration of conservation, education, research and advocacy.
Founded in 1990 by recording artist Don Henley, the Project uses the land it has protected in Walden Woods to foster an ethic of environmental stewardship and social responsibility, both cornerstones of Thoreau’s philosophy.From: https://www.walden.org/who-we-are/mission-and-history/
The site also has the 1837-1847 entries of the Journal of Henry David Thoreau. Thoreau lived at Walden 1845-1847, so you get to see the original material he wrote years and editions before it became Walden (or part of Walden).
Peruse the site if you are studying Walden. Good stuff.