Weidner, Richard T. Sells, Robert L. Elementary modern physics [by] Richard T. Weidner [and] Robert L. Sells. - [2d ed.] - Allyn and Bacon Boston 1968 [1968] - viii, 598 p.illus.24 cm. - College physics series . Subjects--Topical Terms: Physics.--QC LC Class. No.: QC23.W4 1968