Yearbooks, newsletters and bulletins, scrapbooks describing club activities and philanthropic activities spanning the years from 1894 through the present. Furnishings, artworks including paintings and sculpture, clocks, textiles and costumes.

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.