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Allan Nevins
Joseph Allan Nevins Jr. was an American historian and journalist. Nevins was known for his extensive work on the history of the American Civil War and his biographies of such figures as Grover Cleveland, Hamilton Fish, Henry Ford, and John D. Rockefeller, as well as his public service. He was a leading exponent of business history and oral history.
Excerpt from Wikipedia, available under CC BY-SA 4.0.
Books

Grover Cleveland A Study in Courage
2001
ISBN 9780945707288