Bound paper copies of this important work are available for only $12.50 USD from the USGS store. What a great price for a 690 page document complete with maps, fence diagrams, and other fold out plates.
The photo is of the Upper Triassic Chinle Formation capping dark brown cliffs of Middle Triassic Moenkopi Formation in Capitol Reef National Park and is courtesy of the USGS.
Stewart, J.H., Poole, F.G. and Wilson, R.F. 1972. Stratigraphy and origin of the Chinle Formation and related Upper Triassic strata in the Colorado Plateau region: U.S. Geological Survey Professional Paper, 690, 336 p.