Consists of scrapbooks, photographs, personal and business correspondence, administrative records, print materials, newspaper clippings, awards, ephemera, cartoon sketches, and memorabilia that document Hamer's professional and personal life. Series is organized into three categories: Business files; Personal files; and Scrapbooks. Business files include cartoon sketches that humorously depict Hamer and coworkers. Personal files chiefly document Hamer's early life and retirement years, including a brief biographical essay written by Hamer shortly after his retirement. Correspondence in this category includes a typewritten transcription of letters from 1857-1880 that belonged to Hamer's ancestor, Samuel A. Jackson. Hamer's personal correspondence reflects his interest in the visual arts. Scrapbooks include annotated photographs that document the operational history of Foster and Kleiser in Southern California. Scrapbook contents had been removed from their original binders before acquisition, so no order could be determined. Business Files and Personal Files are arranged alphabetically.