Pella, Milton O. Physical science for progress / Milton O. Pella, and Aubrey G. Wood - 2nd ed. - Englewood Cliffs, N. J. : Prentice-Hall, c1964 - 590p. : ill. ; 24 cm. - Prentice-Hall Science series . ISBN: Rs. 48.50 Subjects--Topical Terms: SciencePhysical sciencesRadio activity Dewey Class. No.: 500