The Sackner Archive held the original drawing (donated to PAMM) for the photocopied print depicted from the drawing "P4R" in this catalogue on page 75. In an interview of Ferrari, it is mentioned that he has recently began to produce limited editioned high quality photocopies and heliograph copies of his original drawings. -- Source of annotation: Marvin or Ruth Sackner.

This catalogue was edited by Luis Perez-Oramus. Amazon.com "Leon Ferrari (born in 1920) and Mira Schendel (1919-1988) are among the most significant Latin American artists of the twentieth century. Active simultaneously in the 1960s, 1970s and 1980s in the neighboring countries of Argentina and Brazil, they found inspiration in the written word and in the eloquence of spoken language, and they both used language as important visual subject matter. Published to accompany the first comprehensive survey of the work of each artist in the United States, this essential catalogue presents new insights into the artists' groundbreaking work and examines the connections and collisions between the visual arts, writing, politics and religion in their oeuvres." -- Source of annotation: Marvin or Ruth Sackner.