R8: Flag Insignia of Governmental Maritime Serivces
R9: Coast Guard Cutters on International Ice Patrol
R10: Derelicts Drifting Obstructions
R11: Light Ships Signals of Distress/Overfalls Lightship
R12: International Signal Code
L3: Exports: Port of Philadelphia
L5: Government Aids to Harbor Navigation
L6: Government Aid to Deep Sea Navigation - Captain Taking Observation
L7: Foreign Imports to Philadelphia
United States Custom House