Interesting finds

Joyce Carol Oates's memories of Kaufmann in her story "A Princeton Idyll."
http://writing.upenn.edu/wh/people/fellows/oates.html

Frank Moss's reminiscences of Kaufmann's class on Nietzsche ("brandy in precept" [!])
http://www.princeton.edu/~paw/archive_new/PAW06-07/09-0307/moment.html

Dedication of memorial stone at the University Chapel by Richard Chrisman
http://paw.princeton.edu/article/grateful-student-adds-memorial-kaufmann-chapel-wall

Letters to Publications

"On Karl Kraus," Kaufmann's Letter to The New York Review of Books
http://www.nybooks.com/articles/archives/1973/aug/09/on-karl-kraus/

To The Times Literary Supplement
December 21, 1973: confused with Gordon Kaufman.
February 17, 1978: reply to S. S. Prawer's article.

Personal Correspondence

Kaufmann's letter to Immanuel Velikovsky, author of Worlds in Collision
http://www.varchive.org/cor/various/760223kav.htm

Kaufmann's Correspondence with Martin Buber, from A Life of Dialogue

Former students of Kaufmann's

Schacht's "Translating Nietzsche: The Case of Kaufmann"
Nehamas's foreword in the 2013 edition of Nietzsche

Interview

Interview with Trude Weiss-Rosmarin, editor and founder of The Jewish Spectator