The collection contains correspondence, 1934-1978, and clippings of newspaper articles, 1933-1981, the earlier articles discuss events in Nazis Germany. Steel wrote the column "Johannes Steel on Wall Street" for the New York Post which provides information on investing.
This collection contains correspondence, manuscripts, opera librettos, songs, short stories, novels, sketches, and critical reviews. It also has personal family papers of Kurt (Ashley Vernon) and Greta Hartwig Manschinger, paintings and writings by and other records from Greta's sister Mela Hartwig and her husband Robert Spira, audio recordings, scores, and sheet music, as well as audio recordings of performances.