Denison Library’s Special Collections are extensive and varied, ranging from classical literature to Californiana. They include the Scripps College Archives, which provide a significant record for the study of the college since its inception in 1926 and for the history of women’s education in general.

The Downey Historical Society is located at the Downey History Center in Apollo Park. For more than thirty years, the society's all-volunteer staff has been gathering and preserving records and artifacts from and about the southeastern part of Los Angeles County. The society's collection includes original photographs from 1870 to the present (copy negatives, duplicate prints, or 35-mm slides are…

The collection of the Duarte Historical Society and Friends of the Library focuses on the history of the City of Duarte and adjacent Bradbury. Its archive includes photographs, records, and other artifacts related to the settlers and families who developed Duarte, the local schools, and the local citrus industry..

Immanuel Presbyterian Church has corporate minutes; organizational records of governing bodies, committees, and other subgroups; and membership records. In the church's library are publications dealing with the history of the church, which is over one hundred years old and was known as a leader in the neighborhood, the city, and the Presbyterian community during the 1930s, 1940s, and 1950s.…

The Institute for Baseball Studies is the first humanities-based research center of its kind associated with a college or university in the United States. The Institute is a collaborative effort of Whittier College administrators and faculty members, and the Baseball Reliquary.