Tuttle, M. L., Geological Survey (U.S.). (1991). Geochemical, biogeochemical, and sedimentological studies of the Green River Formation, Wyoming, Utah, and Colorado. [Reston, Va.?]: U.S. Dept. of the Interior, U.S. Geological Survey .MLA Citation
Tuttle, M. L, and Geological Survey (U.S.). Geochemical, Biogeochemical, And Sedimentological Studies of the Green River Formation, Wyoming, Utah, And Colorado. [Reston, Va.?]: U.S. Dept. of the Interior, U.S. Geological Survey , 1991.
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