Addition of Antiphonal Organ and Positiv, "built under the direction of Joseph Whiteford of Aeolian-Skinner. Gilbert F. Adams did the tonal finishing." (church website)
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:
Mechanical and tonal work, Aeolian-Skinner Opus 909A-F.