The photographic negatives are divided into three subseries: Wolff organs with opus number, Wolff organs without opus number, and non-Wolff organs.

This series contains the print copies of journals and conference proceedings in Hellmuth Wolff’s library. There are some annotations on several of the issues. The works are listed in two separate bibliographies in Appendix 1: Periodicals/Journals Bibliography and Appendix 2: Conference Publications Bibliography.

This series contains seven recordings of organ music on Wolff organs.
Beauséjour, Luc (organist). Sonates bibliques = Biblical sonatas. Johann Kuhnau. CBC Records = Disques SRC MVCD 1086, 1996, compact disc.
Choir of the Church of St. John the Evangelist and Patrick Wedd (organist). A liturgical year: Alleluia psallat. Various composers. Church of St. John the Evangelist SJE CD0001, 1996, compact disc.
Fitzau, Jörn (organ builder). Organpipes. J. F. Organpipes, Promotional DVD from Taylor Fladgate.
Grew, John (organist). Livre d'orgue. Nicolas de Grigny. Outremont, Quebec: ATMA ACD 2 2169, 1998, compact disc.
MacDonald, David (organist). Journeys: Organ of Atlantic School of Theology. Various composers. CBC Radio Maritimes, 1997, compact disc.
Musique et tempérament [accord de l'orgue et du clavecin selon les tempéraments anciens]. Pierre-Yves Asselin, organ and Yannick Legaillard, harpsichord. Éditions Costallat MCE 9267-2, 1985, 2 cassettes.
Rousseau, Régis (organist). Johann Pachelbel. Johann Pachelbel. ATMA ACD 2 2173, 1998, compact disc.

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 poems and articles written by members of Sonde.

The series is arranged by subject as indicated.