Leeson, Daniel N. <br/><br/>Basic programming concepts and the IBM 1620 computer Daniel N. Leeson  -- New York, N.Y.  Hol, Rinehart and Winston  1962 <br/>xv, 368 p.  ill.;  23 cm. <br/><br/> Includes index. <br/><br/><label>Subjects--Topical Terms: </label><br/>Computers.<br/><br/><label>Dewey Class. No.: </label>GC 004 L495 1962