, , A. Thompson-Allen Company, A.R. Schopp's Sons, Inc., Allan Miller Associates, American Institute of Organbuilders, Andover Organ Co., Artisan Instruments, Inc., Atlantic City Pipe Organ Supply, Aug. Laukhuff

Arp Schnitger, Organ Builder, British Organ Archive, Chilean Pipe Organ Site, Gottfried Silbermann, Master Organ Builder, Historic Organs of East Tennessee, National Pipe Organ Register, Northern Ireland Pipe Organ Web Site, Organs in Latvia, Organs of the United States and Canada Database, Orgelkunst

Association Pro Musica - Organ Ahrend - Silbermann, Atlantic City Convention Hall Organ Society, Inc., Atlantic City Convention Hall Organs, Ceos v.z.w., Church of Santa Maria della Consolazione in Almenn, Foundation for the Protection of the Main Organ of, Friends of the Wanamaker Organ, Harris, Renatus, Historic Italian Organ Document Archive, Holtkamp Portativ Pipe Organ

Atlantic City Convention Hall Organ Society, Bayard Sharp Hall, University of Delaware, Bethesda Episcopal's Pipe Organ, Broadway Baptist Church, Christchurch Town Hall, Doug's Schlicker Pipe Organ, First-Plymouth Church, UCC, Homebrew Pipe Organ, Moller Organ at Roswell UMC, Rosales Opus 27

British Institute of Organ Studies, Huddersfield Organists' Association, Institute for Pipe Organ Research and Education, Organ Clearing House, Redundant Organ Rehousing Company Ltd., The Institute of British Organ Building

Atalanta Fugiens Portative Organ by Cynthia Large, How to Build a Portative Organ, Organ, Portative Organ, Portative Organ, The Organetto