Pettersen’s collection encompasses over fifty years of architectural practice including project files, sketches, drawings, blueprints, models, slides and photographs representing approximately 600 designs. The collection also contains Pettersen’s personal papers including biographical information, family papers, and photographs. The materials range in date from 1915-2003 (bulk 1950-2000) and are divided into five series: Personal Papers, Professional Papers, Office Records, Project Records, and Artifacts and Models. See the contents list below for more detail about the individual series.