Descriptive InformationCand O CANAL LOCK, PORTION OF SALTY DOG SALOON and MARYLAND HEIGHTS. View taken, from base area of the lock work. Two Almost Identical Photos., Color Negative, 3 1/2 x 5. File. Original caption: Park: HFNHP. Color Negative No. NHF-3567 Aand B 3 1/2 x 5 color print. See Classification No. Subject: C and O CANAL LOCK, PORTIN OF SALTY DOG SALOON and MARYLAND HEIGHTS. View taken from base area of the lock work. Two almost identical photos. Purpose: File. Photographer and Companions: Supt. Martin R. Conway. Date: Fall, 1974.