Charles Anthony Heller, born in Vienna, Austria and later becoming an American citizen, worked extensively in petroleum economics and politics. The Heller collection is concerned primarily with his work in this field.

Hollis Dow Hedberg was a world famous geologist who would become Professor Emeritus at Princeton University. The majority of this collection relates to his work for the Gulf Oil Corporation in various capacities in Venezuela and later in their corporate offices.

Preston taught in the School of Engineering at the University of Kansas from 1955-1991. This collection contains research, class notes, papers, and materials relating to the American Petroleum Institute.

Printed stock form for the Cherokee Oil Mining and Milling Company, signed by F. P. Kaiser, secretary, and J. M. Piper, President.

A native of Phillipsburg, Kansas, Wallace Pratt (1885-1981) was a University of Kansas graduate who began his career in geology with the Kansas Geological Survey. Pratt went on to become a renowned petroleum geologist. This collection of his papers includes maps, photographic materials, and papers relating to geology and the American oil industry. Represented in the collection are companies such as Exxon, Standard Oil, and Conoco.