00302nam a22000977a 4500008004100000022001400041040005500055245001800110260006000128310001600188230720b        |||||||| |||| 00| 0 eng d  a0255-7193  aNational Science LibrarycNational Science Library  aClay research  aNew Delhi: bThe Clay Minerals Society of India, c1982  aHalf-yearly