| Reference | {Deposit:: BRITISH GUIANA GEOLOGICAL SURVEY, 1954, PROVISIONAL GEOLOGICAL MAP OF BRITISH GUIANA, 1 SHEET.}{Deposit:: LEIDSE GEOLOGISCHE MEDEDELINGEN, V. 21, P. 250-375.}{Deposit:: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1076-B, P. 62-65.}{Deposit:: U.S. GEOLOGICAL SURVEY BULLETIN 1228, P. 52-55.}{Deposit:: U.S. BUREAU OF MINES, MINERAL YEARBOOK, 1978-79.} |