1. A cooperative investigation of precision and accuracy in chemical, spectrochemical, and modal analysis of silicate rocks;Fairbairn;U.S. Geological Survey Bulletin,1951
2. U.S. Geological Survey silicate rock standards;Flanagan;Geochimica et Cosmochimica Acta,1967
3. Fuller's earth and other industrial mineral resources of the Meigs-Attapulgus-Quincy District, Georgia and Florida;Patterson;U.S. Geological Survey Professional Paper,1974
4. Bentonite deposits of the Northern Black Hills district, Wyoming, Montana, and South Dakota;Knechtel;U.S. Geological Survey Bulletin,1962