If you are of a certain age, you'll remember well this Lot. Vintage Harter Publishing Self Teaching Flash Cards No. 2135 Addition These were put out by Garry Cleveland Myers, PH.D,of the Cleveland School of Education, back in the 1940s, or so. Cleveland, along with his wife, started the infamous "Highlights' magazine, in 1946. This set is the Addition set, and on the cover of the Original Box, there's detailed instructions on the Prinicpal Involved and Directions for Using, as well as a menu for purchasing addtional Flash Card Sets. All the Flash Card are present, however, two are damaged No. 9 ( 0 + 8) is cut in half, with only the "8" showing No. 52 (1 +5 = 6) is cut in half, with only the "5" and "6" showing You can always explain the missing cards due to "New Math" The Original Box is a bit beat up, with both small ends missing. If you collect Retro School items, or, perhaps you are helping your young child in their work, or home schooling, these are a good get