00725nam a2200205 a 450000500170000000800410001702000150005804100080007308200110008110000240009224501100011626400460022630000320027265000260030465000290033065000180035994200070037799900170038495201180040120260717091433.0260717s1976    ii            000 0 eng d  a0063180472  aeng04a370.781 aCohen, Louis, 1928-10aEducational research in classrooms and schools : a manual of materials and methods /cCohen, Louis, 1928- 1aLondon :bHarper & Row Publishers,c1976.  axvi, 426 p. : ill. ; 25 cm. 4aEducation -- Research 4aÉducation -- Recherche 4aEinführung.  cBK  c32248d32248  001040708DCaBKBCLbBKBCLd1993-08-06g50.00l0o370.78 COHp29625r2026-07-17 09:14:33v50.00w2026-07-17yBK