Mail matter. Ascertainment of cost of handling and transporting the several classes of mail matter and conducting special services: Instruction letter P-F-T [May 1, 1924], Panel post, tests in carrier service.
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Mail matter. Ascertainment of cost of handling and transporting the several classes of mail matter and conducting special services: Instruction letter P-F-T [May 1, 1924], Panel post, tests in carrier service.
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Mail matter. Ascertainment of cost of handling and transporting the several classes of mail matter and conducting special services: Instruction letter P-F-T [May 1, 1924], Panel post, tests in carrier service.