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..

Founded in 1934, the Philosophical Research Society is a nonsectarian center for the study and teaching of the world’s wisdom traditions. The Philosophical Research Society Library’s holdings provide a range of information about various countries and philosophies.