00357nam a22001217a 4500008004100000040005500041080001100096100002100107245003700128246001800165260003900183650001300222230706b        |||||||| |||| 00| 0 eng d  aNational Science LibrarycNational Science Library  a5/6 N0  aKumar, Devender   a विज्ञान जगत  aVigyan Jagat   aNew Delhi: bVigyan Bharti, c1990  aScience