Leason and Lafferty's Graded Collection for Choral Union Classes, Singing Schools, Institutes, Conventions and Public Schools; by L. S. Leason and W. A. Lafferty.L. S. Leason1891EN
Dictionary of Scientific Biography. Volume 17. Supplement 2. Leason Heberling Adams - FRITZ H. LAVES 17Frederic L . Holmes (editor in chief)1990PDF136 MBEN