Willems, Nicholas. Strength of materials / Nicholas Willems, John T. Easley and Stanley T. Rolfe. - 1st ed. - New York : McGraw-Hill, 1981. - xviii, 508 p. : ill. ; 24 cm. Includes index. ISBN: 0070702977 LCCN: 80014657 Subjects--Topical Terms: Strength of materials. Dewey Class. No.: 620.112 / WIS