Treaties and other international acts series. 1681. Parcel post service, within Postal Union of the Americas and Spain, agreement, and final protocol, between United States and other Governments, agreement signed Rio de Janeiro Sept. 25, 1946. final protocol approved by acclamation Sept. 21, 1946 in plenary session of 5th Congress of Postal Union of the Americas and Spain, Rio de Janeiro; entered into force Jan. 1, 1947.

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