Snell, K.S.. New Mathematics: A Unified Course For Secondary Schools Vol.I / Textual Documents K.S.Snell & J.B.Morgan. - 1st ed. / - Cambridge : At The University Press , 1960. - 229p. : ill ; 22cm . Subjects--Index Terms: Mathematics G-Mathematics Dewey Class. No.: 511 / Sn 27 N