00332nam a2200121Ia 450000500170000000800410001704100080005808200130006610000260007924500550010526000410016030000090020120260720174628.0260720s1930    xx            000 0 und d  aeng  a150 HOLI  aHolley, Elmer Charles  aAn introduction to the psychology of the classroom  aNew YorkbD.C Health & Companyc1930  a257p