00330nam a2200133 a 4500001001200000005001700012008004100029040001500070041000800085100002200093245005600115260001200171700001300183NDCL001286020261019154001.0241016s1970    ii    ||||||||||| |eng d   aNDCLcNDCL0 aeng1 aH. K. Dutta Gupta10aElements of AstronomycH. K. Dutta Gupta & B. Ghosh  aKolkata1 aB. Ghosh