Broodthaers Society of America
Phantomas
Here is an incomplete index of contributors from 1953-1980, followed by their issue numbers:

Walter Conrad Arensberg 125, 133
Jean Arp 6
Enrico Baj 4/5
Roland Barthes 13
Samuel Beckett 13
Jorge Luis Borges 9
Marcel Broodthaers 2, 7/8, 9, 15/16, 51, 62, 68
William Burroughs 63
Michel Butor 63
John Cage 15/16
Paul Colinet 31, 78, 99, 158, and many others
Gregory Corso 63
e. e. cummings 15/16
Paul Eluard (many)
Lawrence Ferlinghetti 51
Robert Filliou 50, 118
Elsa von Freytag-Loringhoven 125
Jean-Luc Goddard 63
Raoul Hausmann 10, 65, 68, 78
José Ortega y Gasset 26
Alan Ginsberg 63
Alain Jouffroy 42
Marcel LeComte (many)
Rene Magritte (many)
Marcel et Gabriel Piqueray (many)
Ezra Pound 15/16
Pierre Puttemans 90 (many)
Kenneth Rexroth 125
Alain Robbe-Grillet 63
Muriel Ruykeyser 15/16
Kurt Schwitters 6, 10
Louis Scutenaire 31, 73, 78, 100
Wallace Stevens 15/16
Karlheinz Stockhausen 15/16
Walter Swennen 51
Tristan Tzara 125
Miguel de Unamuno 15/16
Serge Vandercam 43
Freddy de Vree (many)
Paul de Vree (many)
Robert Willems 31, 158 (many)