Fonds reflects Siebner’s intellectual and philosophical interests and ideas on art and life; his interactions with galleries, friends, family and patrons; travels; involvement in the Limners; pre-publication work for his monographs and other books; promotion and sale of art; and public art commissions. The fonds consists of personal writing and poetry, correspondence, sales lists, inventories, exhibition announcements, sketches, clippings, photographs, film and video, prints and drawings.
The fonds consists of film reels and videocassettes featuring artists Maxwell Bates, Ricki Ciccimarra, Leon Erickson, Jan and Helga Grove, Elza Mayhew, Myfanwy Pavelic, and Godfrey Stevens. The fonds also includes footage from the 1983 film "Ninstints" about the 1957 removal and preservation of totem poles from Anthony Island in the Queen Charlottes. Fonds also includes materials from Karl Spreitz’s professional and personal life, including a substantial number of records regarding the work and collaborations of fellow Limners and other artists.