The people associated with Howard Hughes series dates from 1947-1976 and is composed entirely of reference files of newspaper clippings that document Hughes employees, business associates, competitors, and relatives, as well as politicians and government officials that were of interest to Hughes.

The Watergate series dates from 1960-1976 and is composed entirely of reference files of newspaper clippings that document the Senate hearings, impeachment vote, and resignation of the President Richard M. Nixon. Hughes’ political contributions and financial ties to the president’s brother, Donald Nixon and other key figures are also contained in the series.

The organized crime and gambling series is composed entirely of reference files of newspaper clippings that document organized crime and gambling in general in the United States.

The Summa Corporation and Nevada series dates from 1955-1976 and is composed almost entirely of reference files of newspaper clippings that contain materials related to Las Vegas and Nevada, hotels and casinos in Las Vegas, Las Vegas in general, and mining operations primarily in Nevada as well as materials about the Summa Corporation operations and Atomic Energy Commission.

The books, directories, and plaques series dates from 1931-1977 and is composed of books, directories, and plaques. The books are about aviation, navigation, photography, and art. One of the directories is an alumni directory for Thatcher School in Ojai, California, where Howard Hughes was a student from 1922-1923. The plaques were awarded to Hughes Productions by the Young Men’s Christian Association (YMCA) and the United Crusade.

The chronological newspaper clippings series dates from 1946-1976 is composed entirely of reference files of newspaper clippings that are organized only by date.