Thoreau surveys land on Bedford Road for Ralph Waldo Emerson (A Catalog of Thoreau’s Surveys in the Concord Free Public Library, 7; Henry David Thoreau papers. Special Collections, Concord (Mass.) Free Public Library).
Thoreau also writes in his journal:
Young Nealy says that there are blue-winged teal about now . . . (Journal, 12:329-333).