Statistics for occurrence #1 of “Dr. John Torrey” in entry gray-asa of Harper's Encyclopedia of United States History:

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Botanist; born in Paris, N. Y., Nov. 18, 1810; studied botany under Dr. John Torrey , Professor of Natural History at Harvard College in 1842-73; became widely known by his textbooks on botany, which are in general use throughout the United States. He was the author of ; ; ; , and ...
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