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Biographical Information includes a bibliography of Christensen's academic journal articles, some personal recollections about his childhood, and some brief professional information. The journal article listing is current to 1995 and is assembled from many different summaries found in his papers. The personal childhood reflection is dated 1990 and is approximately 25 pages long. The professional information includes a summary of his University of Michigan personnel record (when he arrived in 1955) and also has a ten page reflection about his time as Chair of the Biochemistry Department at the University of Michigan (as recollected in 1992).

The majority of the collection is found in the Correspondence series. It is a collection of letters sent to or by Christensen. It is arranged alphabetically by the last name of the correspondent. Most of the correspondence is single letters and are captured under the "General" heading. There are a handful of individuals with whom Christensen had more extensive correspondence and they have separate folders. There are also letters about specific events and they have also been separated into individual folders. Most of the correspondence relates to research areas. There are few personal letters. The bulk of the correspondence is written after his retirement in 1985. This series is not meant to be a complete account of Christensen's academic or personal correspondence.

Articles and Reprints contains a portion of articles and scientific reprints of articles by Christensen. They date from 1938 to 1992 but are far from complete.

Photographs contains pictures of Christensen alone and in group photos, as well as his colleagues Albert Baird Hastings and Olliver Lowrey. Many of the images of Baird Hastings are copies of group photographs taken at Harvard and elsewhere and were likely collected by Christensen as part his efforts to edit Hastings' life story.