Mail matter. Ascertainment of cost of handling and transporting the several classes of mail matter and conducting special services: Instruction letter P-D-T [May 1, 1924], Parcel post, test of outgoing and incoming mixed parcel post.
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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-D-T [May 1, 1924], Parcel post, test of outgoing and incoming mixed parcel post.
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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-D-T [May 1, 1924], Parcel post, test of outgoing and incoming mixed parcel post.