by Simmons,I.L. and Ewing,G.W | Eastern Analytical Symposium New York, 1975 | Simmons, Ivor L | Ewing, Galen Wood, 1914-.
by Simmons, Ivor I. and Ewing, Galen W | Eastern Analytical Symposium Atlantic City, 1972 | Simmons, Ivor L [ed.] | Ewing, Galen Wood, 1914- [ed.].