...
The American Institute of Architects Archives
Two sets of information sheets (undated, both ca. 1950s) about Victor Gruen Associates, one including biographic sketches of principals Victor Gruen, Rucolph Baumfeld, Edgardo Contini, and Karl O. Van Leuven, Jr.; brochure announcing Victor Gruen International, undated.
Library of Congress
MSS81474, Victor Gruen Papers https://lccn.loc.gov/mm92081474
...