Media Mail is generally used for books, films, printed music, printed test materials, sound recordings, manuscripts, printed educational charts, loose-leaf pages and binders consisting of medical information, and computer readable media. Advertising restrictions apply. Minimum weight is 1 lb. Delivery ranges from several days to two weeks depending on distance. There is no delivery zone up-charge.
Shipping weights determine the price.
Library Rate is a special Class rate, mailed between libraries, schools, universities, nonprofit organizations, and museums. Items that can be mailed at this rate include books, recordings, educational, and museum materials. This rate may be used when mailing from the University of Michigan to an individual who has no financial interest in the sale, promotion, or distribution of the materials. Advertising restrictions apply. Minimum weight is 1 lb.