00244nam a2200097Ia 4500008004100000100002800041245003100069260002900100260000900129300000800138170620s9999    xx            000 0 und d  aSingh- A. & Dixit- S.K. 0aPrarambhik Vigyan Shikshan  bShahitya Prakashan- Agra  c2014  a144