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Heilprin, Angelo (31 March 1853–17 July 1907), geologist and explorer, was born in Satoralja-Ujhely, Hungary, the son of Michael Heilprin, a scholar and encyclopedist, and Henrietta Silver. His father was originally from Russian Poland. In 1856 Heilprin and his family immigrated to the United States, searching for the freedom that had evaded them in both Poland and Hungary. He grew up in New York City and attended the public schools of Brooklyn and Yonkers. At the age of fourteen he entered a hardware concern in New York City in conjunction with his younger brother Louis. He worked there for several years, but he had already decided to become a naturalist and enthusiastically pursued the opportunity to write articles for the ...

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Powell, John Wesley (24 March 1834–23 September 1902), explorer, geologist, and anthropologist, was born in Mount Morris, New York, the son of Joseph Powell, a tailor and Methodist Episcopal licensed exhorter, and Mary Dean. Powell’s parents, who were emigrants from England, moved the family successively west and finally settled in Wheaton, Illinois. Young Powell’s education was intermittent but included some course work at Wheaton and Oberlin Colleges. He worked on the family farm and taught school, but his real interests lay in all phases of natural history and in archaeology. He made numerous collections of natural objects, often by traveling overland or alone in a boat along the Ohio and Mississippi rivers. He became well known among amateur natural historians and was elected secretary of the Illinois Society of Natural History in March 1861....