00305nam a2200085 a 450000500170000010000060001724500910002326000810011430000240019520251203115209.0  d_  aAryabhatta Research Institute of Observational SciencesbFifty golden years (1954-004)  aNainital (UP)bAryabhatta Research Institute of Observational Sciencesc2005  aviii, 82p.c25cm HB