Postage. Important notice; Increased postage rates on letters and post cards to Argentina, Bolivia, Brazil, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, Guatemala, Haiti, Honduras (Republic of), Mexico, Nicaragua, Panama, Paraguay, Peru, Salvador (El), Spain (including Andorra, Balearic Islands, Canary Islands, and Spanish possessions in northern Africa), Uruguay, and Venezuela, Increased postage rates on printed matter, samples of merchandise, commercial papers, and 8-ounce merchandise packages for foreign countries; [issued by] 2d assistant Postmaster General.