Book excerpt: The Wildcatters: An Informal History of Oil-Hunting in America takes a close look at the early histories of the chief oil fields of the United States, with special emphasis on the fields of Pennsylvania, West Virginia and Ohio. The author, himself the son of a successful oilman from Blackford County, Indiana, describes how oilmen without much (if any) knowledge of geology migrated westward from Pennsylvania and West Virginia into Ohio, Kansas, Oklahoma, Texas, and even into California, and how these “wildcatters”—a term for an individual who drills wildcat wells, which are exploration oil wells drilled in areas not known to be oil fields—would often drill holes that would prove to be successful and bring in new fields. Tait explores the very first serious attempt in the United States to develop and oil industry, which was in 1859 in Titusville, Pennsylvania, and how the great Appalachian oil field was developed, with exploration rapidly carried into West Virginia, and continued into Ohio and Indiana. A well-drilling in Findlay, Ohio in 1884 discovered gas, resulting in the opening of the great Lima-Indiana oil field, and the great interior basin fields in Illinois were developed around 1937, largely through the use of geophysics. Samuel W. Tait’s book provides an impressive historical contribution to the history to oil discovery east of the Mississippi River.