The 607 paintings and one sculpture documented in Volume 4 of The Andy Warhol Catalogue Raisonn? were produced during a period of less than three years, from late 1974 through early 1977. In September 1974, Warhol changed studios, moving across Union Square from the sixth floor of 33 Union Square West to the third floor of 860 West Broadway. Like Volumes 2 and 3, Volume 4 is identified with a new studio, where Warhol continued to work for a decade,...