From the Getty Research Institute (via e-mail):
Copies of letters sent by the New York office of M. Knoedler & Co. from 1890 to 1940 have been digitized and are now available through the GRI’s online catalog.
The content of these letters provides a glimpse into the business and personal dealings of one of America’s oldest and most preeminent art galleries.
Cataloging and digitization of the Knoedler Gallery Archive began in January 2013 and was completed with partial funding from the National Endowment for the Humanities.
In total, over 120,000 digital images from the archive—including stock books, commission and sales books, and now the letter copies—are freely accessible online.
Direct to Knoedler Gallery Letter Copying Books
See Also: Learn How the Knoedler Gallery Letter Copying Books Were Digitized