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Keating, William Hypolitus (11 August 1799–17 May 1840), scientist, explorer, and lawyer, was born in Wilmington, Delaware, to Baron John Keating, a colonel in the Irish Brigade of the French army, and Eulalia Deschapelles. Keating’s father settled initially in Delaware after resigning his commission. The family moved to Philadelphia, and Keating entered the University of Pennsylvania in 1813, receiving his bachelor’s degree in 1816. His interest in mineralogy and mining took him to Europe for five years, where he studied at the Paris School of Mines and visited mines in various countries. He returned to the United States and summarized his studies in a monograph, ...

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Mullan, John (31 July 1830–28 December 1909), army explorer, road builder, and lawyer, was born in Norfolk, Virginia, the son of John Mullan, a civil servant, and Mary Bright. The eldest of ten children, Mullan grew up in Annapolis, Maryland, where his father was postmaster at the U.S. Naval Academy. He received his education, beginning at the age of nine, at St. John’s College in Annapolis, from which he received a B.A. in 1847 and an M.A. in 1855. Family tradition holds that Mullan sought a personal interview with President ...