. . . . . . . . . . "Lock's and Canals" . "1792" . "Locks and Canals Company" . "1792" . "Locks and Canals company" . "Locks and Canals" . . "Locks and Canal Company" . "Proprietors of Locks and Canals" . . . . "Locks and Canals on the Merrimack River" . "Its owners" . "Proprietors of Locks and Canals" . .