Sen, . Premire guide to W.B.C.School service commission examination 2012 : pure science chemistry / Sen Sundaram. - / . - Kolkata : Teachers Book Concerns , 2012. - 439p. : ill.,fig ; 21cm . NULL ISBN: RS130.00 (pbk) Subjects--Index Terms: CHEMISTRY-GUIDE BOOK Dewey Class. No.: 540.76 / SEN/P