01509nam 2200373 450 991070653010332120171208131537.0(CKB)5470000002457149(OCoLC)1014340454(EXLCZ)99547000000245714920171208d1968 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierThe composite locks Chesapeake & Ohio Canal National Monument /by Edwin C. Bearss[Washington, D.C.] :Division of History, Office of Archeology and Historic Preservation, National Park Service, U.S. Department of the Interior,1968.1 online resource (iii, 108 pages) illustrations"March 31, 1968.""Historic structures report, historical data section"--Cover.Includes bibliographical references.Composite locks Locks (Hydraulic engineering)Chesapeake and Ohio Canal (Md. and Washington, D.C.)Design and constructionChesapeake and Ohio Canal (Md. and Washington, D.C.)HistoryLocks (Hydraulic engineering)Design and construction.Bearss Edwin C.1391151United States.Office of Archeology and Historic Preservation.Division of History,GPOGPOBOOK9910706530103321The composite locks3444615UNINA