In the 1860s Major John Wesley Powell led a pioneering Grand Canyon expedition on this river
Seeing Things Whole: The Essential John Wesley Powell (Pioneers of... [DOC] [TLE] John Wesley Powell Archives - Utah Department of Heritage and Arts [PAR] The Green leaves Gray Canyon just above the town of Green River, Utah, and ... 
Escalante left a written account, and the expedition's map-maker, Don Diego 
Miera y ... John Wesley Powell embarked on the first of two voyages down the 
Green in May ... Less than ten years after Major Powell's pioneering voyage, the 
first... [DOC] [TLE] John Wesley Powell: Soldier, Explorer, Scientist [PAR] n 1869, John Wesley Powell and nine adventure-seeking companions ... charted 
canyons of the Green and Colorado Rivers.