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Zebulon Pike - Wikipedia
Pike Expedition - Wikipedia
Pike's Expeditions Overview - Pike National Historic Trail Association
Zebulon Pike | Biography & Facts | Britannica
Zebulon Pike spots an imposing mountain - HISTORY
Pikes Peak - Wikipedia
Zebulon Montgomery Pike - Colorado Encyclopedia
Zebulon Pike - 1807 - U.S. National Park Service
Pike’s 2nd Expedition – CO - Pike National Historic Trail Association
Zebulon Pike: Explorer – Colorado Virtual Library