Mansalay

PHILIPPINE BUREAU OF MINES, DATA ON THE PHILIPPINE MINERALRESOURCES: INFORMATION CIRCULAR NO. 22, MANILA, JANUARY1975, P. 13, 41.WORLD MINING, VOL. 27, NO. 12, NOVEMBER 1974, P. 88.PHILIPPINE BUREAU OF MINES, GEOLOGY AND MINERAL RESOURCES OFMINDORO PROVINCE: REPORT OF INVESTIGATION NO. 78, MANILA,DECEMBER 1974, P. 21-22.PERSONAL CORRESPONDENCE, JUNE 15, 1977, FRONTINO INCORPOR-ATED, 2298 PASONG TAMO EXT., MAKATI, RIZAL, P.O. BOX 2869,MANILA PHILIPPINES, COPY ON FILE AT BUREAU OF MINES INDENVER.ANNUAL REPORT, FRONTINO INC., 1977, P. 5.MINING ANNUAL '76 & BUYER'S GUIDE, FRONTINO INC., P. 131.STAFF, 1978 ENGINEERING AND MINING JOURNAL INTERNATIONALDIRECTORY OF MINING AND MINERAL PROCESSING OPERATIONS, NEWYORK, MCGRAW-HILL, 1978, P. 331.