William Maclure
![William Maclure](https://upload.wikimedia.org/wikipedia/commons/b/b5/WilliamMaclure.jpg)
Maclure had a highly successful mercantile career, making a fortune that allowed him to retire in 1797 at the early age of 34 to pursue his scientific, geological and other interests. In 1809 he made the earliest attempt at a geological map of the United States of America. Provided by Wikipedia
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Published: 1988
Superior document: Memoirs of the American Philosophical Society 171