Herblock's papers are at the Library of Congress too

Most people interested in political cartoons know that Herblock's cartoons are in the Library's prints & photos divisions, but until recently I didn't realize that they had 240 boxes of his papers as well.

Herbert Block papers, 1863-2002 (bulk 1945-2001). 70,000 items. Finding aid,
hdl.loc.gov/loc.mss/eadmss.ms008073
http://rs5.loc.gov/…/…/eadxmlmss/eadpdfmss/2008/ms008073.pdf

Correspondence, writings, speeches, interviews, clippings, cartoon reprints, and printed material relating chiefly to Block's career as the political cartoonist "Herblock" for the Washington Post and as author of several books. Also documents his work with the Chicago Daily News and the Newspaper Enterprise Association in Cleveland, and his U.S. Army service. Subjects include cartooning, politics, social activities among Washington's political and cultural circles, and personal affairs. Includes research material for and drafts of his memoirs, Herblock: A Cartoonist's Life (1993) and transcript of an interview conducted by Katharine Graham with Block in 1990.