Mitteilungen der Eugen Rosenstock-Huessy Gesellschaft 26 (October 1977): 5-11. Excerpts from letters in 1957: September 19 and 26; in 1958: February 19 and October 20; in 1959: April 23, May 7, May 20, June 11, June 23, July 14, July 27, August 3, October 15, November 20, December 28; in 1960: July 14, October 7, October 20, October 24, and November 22. Not microfilmed. – 1977