Scientific or mathematical kits, instruments, or other devices 3. Catalogs of the materials named in above items and guides or scripts prepared only for the use with such materials. Sound recordings 2. Museum material specimens, collections, teaching aids, printed matter, and interpretive materials intended to inform and to further the educational work and interests of museums and herbariums. Periodical mail is generally prepared by printers and publishers, and is used for mail distribution of newspapers and magazines.
Special rates apply to written and advertising portions.
Authorization to mail at the periodicals rate must be obtained from the USPS before any mail can be sent as periodical mail. To receive periodical permits, it may take several months for final approval. User's Guide Page created by The Center for Visual Computing . Maintained by The Center for Visual Computing .