00271nam a2200109Ia 450000500170000008000170001710000210003424500350005526000390009030000140012958300180014320260716043552.0  a06.01.01 E61  aEntwistle, N. J.  aEducational research in action  bUniv. of London P.aLondonGBc1972  ax, 342 p.  c2/16/05kJOYD