Subject files maintained by Colker document many of his professional interests, activities, projects, and relationships. Files are comprised of correspondence, printed material, writings, photographs and miscellaneous items in varying combinations. Of particular interest is the file concerning the Art Journal Editing Project. Colker was guest editor of an issue on "Education of the Artist." The file includes responses from Pat Adams, Lawrence Alloway, Eleanor Antinova, Grace Hartigan, Vera Klement, Philip Pearlstein, Peter Plagens and Martin Puryear, to the question: "What are you saying or introducing as major currents to students today that have changed from a few years ago and what events or dynamics have generated your reconsiderations? (If you are holding and reinforcing constants, please indicate that, too.)" Other subjects of interest include Haybarn Press; poets Michael A. Anina, Catherine Kasper, and Kathleen Norris; and Dave Brubeck, whose music inspired a Haybarn Edition. This series contains one audiovisual recording titled "National Endowment for the Arts/Getty Art Program Tape," the pilot for a proposed PBS television program on the arts for children and their parents for which Colker served as a consultant.
Subject files are alphabetized by title. Additional material relating to many of the individuals and organizations documented by subject files may be found with correspondence (Series 2) and among the printed material (Series 6).
Use of original material requires an appointment and is limited to the Archives' Washington, D.C. Research Center. Use of archival audiovisual recordings with no duplicate access copy requires advance notice.