The Eight-cent Prexie
Fourth class book rate
The fourth class rate for mailing one book weighing over eight ounces up to one pound and having more than 24 total pages was eight cents from January 1, 1949 until August 1, 1958.
This box contains one book of more than 300 pages weighing 15.2 ounces total and mailed in 1951.
On July 27, 1953, sixteen millimeter non-commercial films were added to the materials that could be sent under the fourth class book rate.