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Accession consists of the private family correspondence of Karl A. Clark, including personal news and descriptions of oil sands research.

Accession consists of photographs from the private album of Karl A. Clark, depicting family members, locations in western Canada, the Road Materials Survey, and other subjects. The accession also contains a photograph of the staff of the Research Council of Alberta from Mrs. D. S. Pasternak.

Accession consists of photographs of the Great Canadian Oil Sands plant in Fort McMurray (1964-1967) and interviews with tar sands researchers (and colleagues of Karl Clark) Gordon Hodgson, Mary Livingstone, and Lillian MacLennan (1982-1983).

Accession consists of photographs of separation plants, bitumen and oil extracting sites, and other subjects related to Karl A. Clark and Alberta oil sands. The photographs include panels used for a display about Clark.

Accession consists of Clark family photo albums, including photographs of the Shearer family, the Cocks family, Karl Clark, and others. Many of the photographs have captions.

Accession consists of records collected by Karl A. Clark, including a scrapbook (1900-1951), family letters (1936-1958, 1967-1968) and "Recollections of Life in Germany" by his father M. S. Clark (1893-1895).

Accession consists of the personal diaries of Karl Clark about a trip to the United States (1926), bituminous sands and the Athabaska River (1927), and Bitumont (1949). The 1927 diary is accompanied by photographs.