Exhibition catalogue published in conjunction with centennial show held at the Solomon R. Guggenheim Museum, New York, 1971. Writing by Dr. L.J.F. Wijsenbeek, Robert P. Welsh, Joop Joosten, Nelly van Doesburg, Max Bill, and Margit Rowell. Includes checklist of the exhibition, chronology, and selected bibliography. Copiously illustrated in black-and-white and color.