Parcel post. Parcels containing written communications, instructions for repairs, or other unauthorized written inclosures or additions not to be accepted for mailing at less than 1st-class rate; [issued by] 3d assistant Postmaster General.
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Parcel post. Parcels containing written communications, instructions for repairs, or other unauthorized written inclosures or additions not to be accepted for mailing at less than 1st-class rate; [issued by] 3d assistant Postmaster General.
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Parcel post. Parcels containing written communications, instructions for repairs, or other unauthorized written inclosures or additions not to be accepted for mailing at less than 1st-class rate; [issued by] 3d assistant Postmaster General.