00533nam a2200181 i 4500000000073266CaOOAMICUS20090525000000.0090525s1950 xxk u000 u eng u44438SeMilitaSumner, William Leslie.Visual methods in education /by W. L. Sumner.Oxford :Blackwell,[195?]231 p. ;20 cm.Educazione.SeMilSeMil1Venegono12Q IV 1953941839418SeMilBibl239422 1