Included in the collection are annual reports, financial records, minutes, publications, newsletters, promotional materials, calendars, schedules, legal documents, audio visual materials in the form of audio cassettes, 16 mm films, slides, and photographs. Subjects of these materials center around the various camping programs offered at the site from boys and girls summer camps to adult retreats and corporate functions. There are records of several directors and the presiding board, including developmental reports and outreach materials. Several years of the Twin Rocks Sandpiper newsletters are also included as well as plats of the grounds and some architectural drawings of various buildings. Copies of a 1925 published songbook titled Twin Rocks Summer Camp Songs in the collection are in fragile, but usable condition.