00313nam a2200121Ia 45000030006000000080041000060400015000471000037000622450012000992600051001115460012001620050017001740STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aPhysical Science Study Committee  aPhysics  bNational Council of Educational Researchc1966  aEnglish20220125170103.0