TY - RPRT TI - Distribution of tungsten in heavy-mineral-concentrate samples from the Charlotte 1° x 2° quadrangle, North Carolina and South Carolina AU - W. R. Griffitts AU - J. W. Whitlow AU - K.A. Duttweiler AU - D. F. Siems AU - L. O. Wilch PY - 1984 DO - 10.3133/ofr84843i UR - https://pubs.usgs.gov/publication/ofr84843I ID - ofr84843I ER -