00285nam a2200109Ia 4500008004100000082001500041100001900056245004200075250000800117260003900125300001100164190709s9999    xx            000 0 und d  a371.3 P91F  aPepe, Thomas J 0aFree and inexpensive educational aids  a2nd  aNew YorkbDover Publicationsc1962  axi,192