Concord, Mass. Thoreau writes in his journal:
P.M.—Water three and a half inches above summer level. I measure the rapidity of the river’s current . . . (Journal, 12:258).
Billerica, Mass. [Jonah] Hill writes to Thoreau (The Writings of Henry D. Thoreau (ucsb.edu); MS, Special Collections, Concord (Mass.) Free Public Library).
