Descriptive InformationCand O CANAL LOCK and PORTION OF SALTY DOG SALOON. Portion of Maryland Heights, in background. Subject across the Potomac River from Harpers Ferry. Two almost.... File. Original caption: Park: HFNHP. Color Negative No. NHF-3566 Aand B 3 1/2 x 5 prints. See Classification No. Subject: C and O CANAL LOCK and PORTION OF SALTY DOG SALOON. Portion of Maryland Heights in background. Subject across the Potomac River from Harpers Ferry. Two almost identical photos. Purpose: File. Photographer and Companions: Supt. Martin R. Conway. Date: Fall, 1974.