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Cover Page, Preface, Contents, Chapters, Appendices and the Glossary PDF . . Oil and Gas Field Code Master List . Field code information for all fields located in the States of Alabama, Alaska, Arizona, Arkansas, California, Colorado, Florida, Illinois, Indiana, Iowa, and Kansas. PDF Field code information for all fields located in the States of Kentucky, Louisiana, Maryland, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Mexico, New York, North Dakota, and Ohio. PDF Field code information for all fields located in the States of Oklahoma, Oregon, Pennsylvania, South Dakota, and Tennessee.