Nepheline Occurrences

U.S. BUREAU OF INDIAN AFFAIRS, 1977, STATUS OF MINERALRESOURCE INFORMATION FOR THE ROCKY BOYS INDIAN RESERVA-TION, MONTANA: ADMINISTRATIVE REPORT BIA-34, P. 60-61HUBBARD, C.R., ROBY, R.N., AND HENKES, W.C., 1963, MINHERALRESOURCES AND THEIR POTENTIAL ON INDIAN LANDS; ROCKY BOY'SRESERVATION, HILL AND CHOUTEAU COUNTIES, MONTANA: U.S.BUREAU OF MINES PRELIMINARY REPORT 148, 16 P.PECORA, W.T., 1942, NEPHELINE SYENITE PEGMATITES, ROCKY BOYSTOCK, BEARPAW MOUNTAINS, MONTANA: AMERICAN MINERALOGIST,V. 27, NO. 6, P. 397-424.PECORA, W. T., AND OTHERS, 1957A, GEOLOGIC MAP OF THEWARRICK QUADRANGLE: U.S. GEOLOGICAL SURVEY MISCELLANEOUSGEOLOGIC INVESTIGATIONS MAP I-237.