Clippings from various newspapers, including Grinnell's Scarlet Black, detailing Welch's accomplishments after Grinnell as an attorney, specifically his trial defending the United States Army against Joseph McCarthy.
Duane Krohnke's handwritten research notes on Leonard Bernstein's career, specifically his time as the conductor of the New York City Philharmonic Orchestra from 1941-1957, and articles detailing Joseph Welch's time with the orchestra.
Notes between Duane Krohnke and various institutions and people with connections to Joseph N. Welch, whether through person association or association through Hale and Dorr, Welch's law firm.
Krohnke's notes on the Joseph Welch papers kept in the archives and special collections of the Boston Public Library, including letters between Krohnke and representatives of the special collections at Boston Public Library as well as between Krohnke and Joe Wall, professor of history at Grinnell College during Krohnke's research.