Broodthaers Society of America
Sondern
Officially <i>Sondern: Jahrbuch für Texte und Bilder</i>, this compact and lovely artists' journal was a not-quite annual compendium (seven volumes in ten years) populated by many of the great book artists of the era: Robert Filliou, Richard Hamilton, Dorothy Iannone, Dieter Roth, Ed Ruscha, Emmett Williiams, and of course Marcel Broodthaers, albeit posthumously. 
Zürich: Dieter Schwarz, 1976-86. Seven issues, all published. Profusely illustrated in b&w. German, French, Dutch, English.