Powell John Wesley
Powell
, John Wesley 1834-1902. American geologist and ethnologist who explored and mapped the Grand Canyon (1869 and 1871), directed the US Geological Survey (1881-1894), and classified many Native American languages.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.