The 1978 O-Pee-Chee set was further reduced to 242 cards and again had heavy representation from the two Canadian teams. The cards measure the standard 2-1/2" x 3-1/2" and the backs are printed in both French and English. The cards use the same design as the 1978 Topps set. Some of the cards contain an extra line on the front indicating a team change. - 2007
Standard Catalog of Baseball Cards, 16th Edition.