Whitman Publishing 1959 Subtraction Help Yourself Flash Cards Set 2 #4742

Whitman Publishing 1959 Subtraction Help Yourself Flash Cards Set 2 #4742. Vintage set of Flash Cards. Complete Subtraction Set 2 has 84 cards (2 Instruction cards + 82 Double Sided Flash Cards). These are larger flash cards measuring approximately 7" x 4". Original box has some wear but is still sound. There is some faded writing in pencil on the box and the one instruction card. Please see pictures.