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1956
143. Engineer's Role in Missile Development, Ballhaus, W.F. , 15th National Conference, El Cortez Hotel, San Diego, California, April 30 - May 4, 4/30/56, San Diego, California, p.4, (1956)
1955
113. Clear Design Thinking Using the Aircraft Growth Factor, Ballhaus, W.F. , 14th National Conference, Hilton Hotel, Fort Worth, Texas, May 2-5, 5/2/55, Fort Worth, Texas, p.33, (1955)