Materials related to high school mail art exhibition, funded by the National Education Association, and organised by Cracker Jack Kid (see Folder: 632-42). Cover with 1 enclosure. Cover ornamented with rubber stamps in red ink: "EXPRESS", oval seal design with horse and "PONY EXPRESS MAIL ART ROUTE", and sender's return address. 2 US Letter sheets stapled together enclosed. Typewritten letter in purple ink, call for submissions to the "TEACH" Mail Art Show running in conjunction with the 3rd National High School Postal Art Exhibition, where practicing mail artists exhibit alongside and exchange art with high school student artists. Deadline January 30 1981. US Half-Letter saddle-stapled booklet with integral address plate. Catalogue of exhibition with text by Cracker Jack Kid (Chuck Welch). Exhibition ran May 4-17 1981.