Professional papers. 248-C. Mica deposits of southeastern Piedmont: pt. 3, Ridgeway-Sandy Ridge district, Va. and N. C, pt. 4, Outlying deposits in Virginia, distribution and structure of pegmatite bodies in area, their mineralogical characteristics, and economic possibilities of mica and other pegmatite minerals [with list of references cited] by Wallace R. Griffitts, Richard H. Jahns, and Richard W. Lemke.