Theory and Practice of Analytical Refraction and Orthoptics, by Israel Dvorine...introduction by Emmett Albert Betts..Israel Dvorine1943
An index to professional literature on reading and related topics (to January 1, 1943) by Emmett Albert Betts ... and Thelma Marshall Betts.Emmett Albert Betts1945
Guide to spelling progress. Glossary ed. Grade four Emmett Albert Betts Mabel-Louise Arey.Emmett Betts1941