Updated through on-line information from James R. Stettner. -- This was the addition of the prepared-for Great 8' Principal and Swell 8' Viola Celeste. Documented March, 1988.
Identified through information adapted from E. M. Skinner/Aeolian-Skinner Opus List, by Sand Lawn and Allen Kinzey (Organ Historical Society, 1997), and included here through the kind permission of Sand Lawn:
Addition of two prepared-for stops to Aeolian-Skinner Opus 980 (1938).