The 1971-1972 Additions (Box 9-13), contain correspondence, office memos, subject files, editorial reprints, writings, notes and newsclippings, and memorabilia, and date circa 1940-1971. The documentation, however, is not extensive, and coverage is good only for Lasch's years at the St. Louis Post-Dispatch.

The correspondence is predominantly incoming and arranged chronologically. Significant correspondents include Herb Block, Marquis Childs, Henry Steele Commager, Frederick Deming, J.W. Fulbright, Hubert Humphrey, Edward V. Long, Arthur M. Schlesinger Jr., Adlai Stevenson and Stuart Symington. There are also separate folders of reader protest of St. Louis Post-Dispatch editorials concerning the Vietnam War and the Nixon-Agnew administration.

The office memos, both general and between Lasch and Joseph Pulitzer Sr., are arranged chronologically. They provide some insight into the editorial decisions made by the St. Louis Post-Dispatch during Lasch's tenure.

The subject files are arranged alphabetically and treat a number of topics, including cigarette advertising, McCarthyism, civil rights, pacifist rights during the Vietnam War, the Nieman Foundation, national defense, and Lasch's relationship with Stuart Symington and Adlai Stevenson.

The Editorial reprints from the St. Louis Post-Dispatch are fairly complete for the years 1960 to 1963 and 1968 to 1971. The writings consist of published articles, the most nearly complete file of which is that for The Progressive (1953-1957), and an unpublished book (1946-1947) as well as unpublished and undated short stories.

The notes, drafts and newsclippings deal with the presidential campaigns of 1952 and 1956, Vietnam (1967-1968), and the career of Robert Lasch. Memorabilia include material related to the 1966 Pulitzer Prize ceremony and other materials concerning his activities.