The Church collection contains primarily office and project records. Archival materials include correspondence, subject files, a scrapbook documenting his published work, public relations files, portraits, photographs, a travel photograph album, and exhibit boards. The bulk of the collection is comprised of more than 1100 projects files which may contain correspondence, plant lists, reports, clippings, photographs, and drawings.

The Karl Linn Collection spans the years c.1925-2005 (bulk 1955-2005) and includes files documenting the life and professional work of landscape architect Karl Linn. The Collection is categorized into six series: Personal Papers, Professional Papers, Faculty Papers, Office Records, Project Records, and Additional Donations. The Project Records make up the bulk of the Collection and consist of correspondence, notes, slides, photographs, magazine and clip files, and drawings.