1. Mercury in sedimentary rocks of the Colorado Plateau region;Cadigan;U.S. Geol. Surv., Prof. Pap.,1970
2. Elemental abundances in Green River oil shale;Cook;Chem. Geol.,1973
3. Resource appraisal of three rich oil-shale zones in the Green River Formation, Piceance Creek basin, Colorado;Donnell;Colo. Sch. Mines, Q.,1970
4. Determination of mercury in geologic materials by flameless atomic absorption spectrometry;Huffman;U.S. Geol. Surv., Prof. Pap.,1972