Statistics for occurrence #1 of “Lieut. Z. M. Pike” in entry colorado of Harper's Encyclopedia of United States History:

...der in the Mexican cession of 1848. Francis Vasquez de Coronado is believed to have been the first European explorer of this region in 1540. In 1806 President Jefferson sent an expedition, under Lieut. Z. M. Pike , to explore this region, and it nearly crossed the territory from north to south in the mountain region, and discovered the mountain known as Pike's Peak. In 1820 another expedition, under Col....
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