The National Micrographics Association (NMA) (roughly .2 linear feet) consists primarily of correspondence and NMA's "Manual for Standards Committee Chairmen". This series offers a glimpse into the work of several committees Kruger participated in. Some of Kruger's ISO and ANSI work is represented here.
The Association for Information and Image Management (AIIM) material (a continuation of the National Micrographics Association series) consists of approximately .6 feet of material primarily related to AIIM standards committees. The documents relate to several committee and groups Kruger participated in, including the C-7 Microrecording of Engineering Graphics Committee and the C-18 Standards Committee for Public Records. There is also a significant amount of Kruger's work with various Working Groups of ISO Technical Committee 171. The ISO material covers various micrographic standards, including N 51 "Microfilm of technical drawings and other drawings office documents" and N 42 "Method of measuring thickness of build-up area on aperture cards and copy cards."
The Association for Information and Image Management material includes draft standards, proposals, and transparencies for a talk Kruger gave in 1984. Of particular note is Kruger's correspondence with fellow committee members and other AIIM members, including: Carl Anderson, Don Avedon, Thomas Campbell Bagg, Jr., George Biach, Barton A. Benshoof, Marilyn Courtot, Harold Fromm, Ted Hodur, Harry B. Kidd, Ron Kinney, Peggy Linaugh, Donald W. "Scotty" McArthur, Carl Nelson, Dale Rupp, Heinz Müller-Saala, and Herbert J. White. The series also contains some print materials and organizational directories.
The 3M series largely consists of internal memoranda between 3M staff. The 3M correspondence covers several central themes including: Kruger's standards activities with AIIM, ANSI, and ISO; discussion about how and to what extent 3M should be involved in standard-setting organizations; and exchanges about what standards are used in 3M's international divisions. An invitation and booklet for a 3M awards banquet also forms part of the correspondence, memos, and circulated writings group. Correspondents represented in the 3M series include: Kurt Dormann, J. Hensel, James Hollinger, Dale Rupp, and T. J. Sonnonstine. While the correspondence mostly consists of paper, 6 microfilm cartridges also make up part of the series. Additional materials in the series include a listing of significant 3M micrographic patents, a John Deere micrographic standards manual, and a draft of a presentation Kruger gave on standards.
The Personal series consists of material related to Kruger's career and achievements. A highlight of the series is a scrapbook that through photographs, correspondence, cards, and other materials, record Kruger's achievements as well the collegial culture of 3M's Micrographic Products Laboratory. Kruger's many professional awards, some mounted on plaques, ephemera from conferences, an address and business card file, and material from a University of Wisconsin course form the other central part of this series.