Powell Geographic Expedition of 1869 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Powell Geographic Expedition of 1869" in English language version.

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Powell, John Wesley (2004). Seeing Things Whole: The Essential John Wesley Powell. Island Press. p. 44. ISBN 978-1-55963-873-9.

gutenberg.org

Powell, John Wesley (1895). The Exploration of the Colorado River and Its Canyons (formerly "Canyons of the Colorado").

kaibab.org

Ribokas, Bob. "Grand Canyon Explorer: The Powell Expedition". Retrieved 14 September 2022.

nps.gov

"USGS: John Wesley Powell: Soldier, Explorer, Scientist". www.nps.gov. Retrieved 2022-09-15.

pbs.org

shoppbs.pbs.org

"American Experience . Lost in the Grand Canyon . People & Events | Howlands & Dunn | PBS". www.shoppbs.pbs.org. Retrieved 2022-09-15.