By J. Markowitz in collaboration with J. Archibald and H. G. Downie. by Edna Yost, in collaboration with Dr. Lillian M. Gilbreth. A. G. Brown, in collaboration with D. W. Langridge & J. Mills. By J. Markowitz, J. Archibald [and] H.G. Downie. Donald P. Warwick, in collaboration with Marvin Meade and Theodore Reed. J. P. Holman in collaboration with W. J. Gajda, Jr. K. D. Stroyan in collaboration with W. A. J. Luxemburg. by Alfred Tarski, in collaboration with Andrzej Mostowski and Raphael M. Robinson. by L. M. Parr in collaboration with C. A. Hendley.