00627nam a2200169Ia 450000500170000000800460001703700120006304000210007504100130009608400190010910000230012824501940015126000540034530000120039965000210041170000250043220250508161450.0008  250505s9999    xx            000 0 eng d  aTextual  aFEDL bengcFEDL  aeng2eng  a507, LATqFEDL  aLaton Anita Duncan 0aNew directions in science teaching: A report of a cooperative project in seventeen secondary schools with the Bureau of Educational Research in Science Teachers College, Columbia University  aNew York, USAbMcGraw Hill Book Company Incc1949  axi,164p  aScience teaching  a Powers Samuel Ralph