This series includes large-scale drawings, preliminary sketches, and general plans of various parts of the organ, such as the buffet, console, keyboards, and windchest. This series is divided into three subseries: organs with opus number; organs without opus number, which includes Wolff’s plans for proposed but ultimately not-constructed organs; and finally plans by other organ builders or Wolff’s drawings based on historical treatises and documents.

This series contains published annual calendars from three European organ builders.

Series consists of four subseries: P125/A1 History (1972 and 1987), P125/A2 Charters and Certificate of Incorporation (1975-1977), P125/A3 Constitution and By-Laws (1970-1982), and P125/A4 Seal (1970). Includes a presentation, correspondence, forms, by-laws, statements, seal, a franchise tax report and a certificate of incorporation.

Series consists of two subseries: P125/C1 Correspondence of the Officers and P125/C2 Correspondence with Members. Includes almost only correspondence.

The photographs in this series cover the several stages of the organ-building process. This series includes both colour and black-and-white images of the construction of a given organ at Wolff’s atelier, the installation of the organ, as well as concerts, dedications, and social events at or around the time of the organ’s installation.

This series consists of photographs with Sonde event number indicated if known.

Series consists of five subseries: P125/E1 Membership Proposal Files, P125/E2 Honorary and Emeritus Membership, P125/E3 Ballots, P125/E4 Membership List, P125/E5 Certificates and Medals.

This series contains several hundred files containing notes and records of meetings, symposia, conferences, and congresses attended by Gloor. At several of these Gloor presented the keynote address (the Berger Lecture, 1993, is a typical example of this type).