Den Hartog, J.P. Strength of materials/ J.P. Den Hartog - New York: Dover Pubs, 1949 - viii, 323 p.: ill.; 21 cm. Includes index ISBN: $ 5.00 Subjects--Topical Terms: strength of materialsStrains and stressesBeams(Engineering)--TestingTesting Dewey Class. No.: 620.11