The Concord Free Public Library’s Special Collections holds a rich and extensive collection relating to Herbert Wendell Gleason (1855-1937), a prominent American landscape photographer and environmentalist. The holdings include close to 7,000 Gleason negatives on glass plates and film, Gleason’s slide lecture “Thoreau’s Country,” albums of Concord, and Thoreau-related images compiled by Gleason himself, as well as correspondence and lecture notes.