Subjects: Concord River (Mass.) -- Description and travel; Merrimack River (N.H. and Mass.) -- Description and travel; Thoreau, Henry David, 1817-1862 -- Travel -- Massachusetts -- Concord River; Thoreau, Henry David, 1817-1862 -- Travel -- Merrimack River (N.H. and Mass.). 13 chapters, 115,216 words. Public domain, via Project Gutenberg.