Mail matter. Cost ascertainment: Instruction letter L [July 1, 1929], Measurement and apportionment of floor space [occupied by main post offices and by all stations, except contract, and branch offices].
Publication Title:
Mail matter. Cost ascertainment: Instruction letter L [July 1, 1929], Measurement and apportionment of floor space [occupied by main post offices and by all stations, except contract, and branch offices].
Display Title:
Mail matter. Cost ascertainment: Instruction letter L [July 1, 1929], Measurement and apportionment of floor space [occupied by main post offices and by all stations, except contract, and branch offices].