The quality and related characteristics of crude oil Is produced and marketed throughout the United States is of both theoretical and practical interest to producers, refiners, marketers, and consumers as well as to state and federal agencies. The Bartlesville (Oklahoma) Energy Technology Center (BETC), a part of the U.S. Department of Energy (DOE), analyzes crude oils from around the world and this report presents 800 of those analyses from major fields in the United States. Listed by state and field, the analyses, as performed by the U. S. Bureau of Mines Routine Method of Distillation, are part of the BETC open file of about 9,000 crude-oil analyses. This report provides a measure of the quality of the nation's crude-oil reserves. It includes an individual analysis for each oil to provide crude-oil quality data, geographical and geological origin of each oil, and analytical and computed data useful for determining hydrocarbon-type composition and refinability.