I currently have a copy of "Hymn-Tune Voluntaries Part 1". This is notated (Curwen Edition 8826) For the Organ, American Organ, and Harmonium.It was published in London by J. Curwen & Sons Ltd., 24 Berners Street, W. i. A second address shows U.S.A. : Curwen Inc., Germantown, Philadelphia.
I believe there are other Parts in this series as I have seen a refernce to Part 4.
I am trying to obtain copies of the music for any other volumes in this series apart from part 1.