February 7, 1974: Overtaking the Avant-Garde
The Age of the Avant-Garde: An Art Chronicle of 1956-1972 by Hilton Kramer
Discovering the Present: Three Decades in Art, Culture, and Politics by Harold Rosenberg
November 20, 1969: Art's End (letter)
August 21, 1969: The Shape of Things to Come
Brancusi: A Study of the Sculpture by Sidney Geist
Modern American Sculpture by Dore Ashton
David Smith by David Smith edited by Cleve Gray
Beyond Modern Sculpture by Jack Burnham
February 1, 1963: Dim Beginnings
The Eternal Present Vol. I: The Beginning of Art (The A.W. Mellon Lectures in Fine Arts, 1957) by S. Giedion