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Keywords: Lock 71 on Chesapeake and Ohio Canal from HABS.png en Lock 71 This is the upstream most of the composite locks so note the rough stonework which was normally covered with wood to protect the boats HABS says 1 GENERAL VIEW OF LOCK LOOKING NORTH - Chesapeake Ohio Canal Lock 71 167 0 miles above tidewater Oldtown Allegany County MD LOC-image hhh md0897 Historic American Buildings Survey MD-816-1 39 54139 -78 61167 Chesapeake Ohio Canal National Historical Park |