Brueckner, Leo J. Making Number Discoveries / Leo J. Brueckner, Elda L. Mertton and Foster E. Grossnickle - New York : Hjolt, Rinnehart and Winston, Inc, 1960. - 378 p. : ills; 25 cm. Subjects--Topical Terms: Arithmetic Dewey Class. No.: 372.7 / BRU 1960