1950s Dolch Arithmetic Learning Series - Subtraction Popper Numbers. Self teaching arithmetic flash card set, designed by Edward W. Dolch, Ph.D. Published by The Garrard Press in Champaign, Illinois.
1950s Dolch Arithmetic Learning Series - Subtraction Popper Numbers. Self teaching arithmetic flash card set, designed by Edward W. Dolch, Ph.D. Published by The Garrard Press in Champaign, Illinois.