The Calvary Hour Records are divided into six series:

(1) Sermons, 1940-2002

(2) Publications and Publicity, 1935-2007

(3) Administrative Files, 1937-2007

(4) Photographs, Circa 1935-2002

(5) Sound Recordings, 1953-2007

(6) Radio Show "Formats," Circa 1965-2000

Files pertaining to radio spots and brief radio programs marketed to Mennonite congregations to educate the non-Mennonite population about the Mennonite Church and provide "an upfront invitation to consider Christ."  Researchers should note that recordings of these spots and programs are not included in this series.

Incoming and outgoing correspondence regarding media program development in the United States and abroad, relationships with other Mennonite publishers and broadcast outlets, and listener response or "testimonies" regarding the programming. Also includes some Mennonite Media division minutes and reports.

Files pertaining to the Choice radio program, a primarily domestic evangelism program that ran for thirteen seasons.  Materials include scripts, reports, testimonies, and station sheets.  Researchers should note that recordings of the Choice radio program are not available in this series.

These records were generated by listener response to Mennonite radio programming, particularly the Mennonite Hour (1951-1979) and Heart to Heart (1950-1975). Mennonite Media (then called called Mennonite Broadcasts, Inc.) employed staff to handle listener correspondence.  The Mennonite Hour also had an extensive home Bible study program that generated further correspondence.

In the mid-1990s these files were sampled; only 5% (every twentieth set of correspondence) of the original correspondence was retained.  The other 95% was destroyed. From this sampling, however, researchers can get a sense of the questions asked and responses offered.

Incoming correspondence is filed by listener's last name.  Topic files are are response letters to individual letter writers from the counseling staff.

Production files for the Mennonite Hour radio show, the first program produced by Mennonite Broadcasts, Inc. (later Mennonite Media).  The show ran from 1952 to 1978 and featured preaching, worship, and religious music.  Most abundant in these files are correspondence with radion station managers.  The files include meeting minutes, reports, evaluation studies, station history sheets, and miscellaneous materials.

Production files pertaining to the program Your Time, a five-minute weekday religious radio show aimed at women.  Topics addressed in the show included personal development, self-esteem, marriage, family, parenting, managing stress, and making positive choices.  Files include annual reports, staff meeting minutes, program "auditions" (small studies of listener reactions to the programs) and evaluations, radion station history sheets, and miscellaneous materials.

The professional, pastoral, and personal papers of Nelson E. Kauffman, a long-time Mennonite church missionary and administrator, are divided into five series:

(1) Correspondence and Subject Files, 1911-1981

(2) Radio Ministry, 1948-1958

(3) Prison Ministry, 1940-1968

(4) Photographs and Scrapbooks, 1937-1967

(5) Christmas Carol Kauffman, 1951-1976