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.

This series consists of photographs with a de Mestral event number indicated if known.

The Photographs series contains biographical and professional photos of Paul Pedersen alone and with others, as well as miscellaneous photos and proof sheets.

The Photographs Series contains autographed photographs of Alban Berg, Fritz Heinrich Klein, and Bernhard Sekles, as well as photographs of Julius Schloss. Additional photographs printed in other series of the collection are listed below as well.

This series consists of many photographs, mostly black and white, (1929-1935, 1967-1984). Many of them can be identified in Alice Johannsen's book or within the scrapbook or the files themselves. Some of these photographic prints are also in the Archives photographic inventory. Subject matter ranges from skiing events and family gatherings to miscellaneous prints sent by fans. Many are snapshots but there are a number of press photographs.

The photographic material mainly consist of Pyper’s early childhood in Stratford, time at McGill University, travels to the Yukon and Brazil while researching and writing his novels, and living in Toronto.