This subseries spans 1951 to 1956 and contains background information, ads, and promotional materials for Zerone and Zerex anti-freeze. Included are copies of "Selling Slants" newsletter, distributed to Zerone-Zerex salespeople, and "Zerone-Zerex Newsletter," a weekly publication probably circulated to members of the Zerone-Zerex Section. Also included are reports and surveys on the advertising and sales of Zerone and Zerex. The reports are organized alphabetically by author. A number of them are surveys done by mid-western newspapers and publications. The files also contain pamphlets and other promotional materials on Zerone-Zerex. Some of the promotional materials are signs, stickers, streamers, and cardboard cut-out figures for the Frank Leahy television show.