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The Library of the Proprietors of Locks and Canals on the Merrimack (commonly referred to as the Locks and Canals Book Collection) contains works used in the construction, maintenance, and improvement of the Lowell canal system and its mechanisms as well as the hydroelectric plants under the Proprietor’s purview. It is comprised of what would have been state of the art books and pamphlets, in English as well as French, dating from the 17th to the early 20th century. Subject areas include architecture, astronomy, civil engineering, law, mechanics, and physics with many of the tomes heavily illustrated. It is hat this self-contained library, that served the informational needs of one of the oldest corporations in North America, has survived intact. The prospective use of these antiquarian books may be predominantly in the area of the history of engineering.