References: |
- Deposit:: WEBBER, B. N., 1942, MANGANESE DEPOSITS OF COSTA RICA, CENTRAL AMERICA: AM. INST MIN. METALL. PETROL. ENG. TECH. PUB. 1445, P. 5-6.
- Deposit:: KUYPERS, E. P., AND DENYER CH., PERCY, 1979, LOS YACIMIENTOS MANGANESIFEROS DE LAS RADIOLARITAS DEL COMPLEJO OFIOLITICO DE NICOYA, COSTA RICA: CIENC. TEC., V. 3, NO. 1, P. 81-97.
- Deposit:: U.S. GEOLOGICAL SURVEY, DIRECCION GENERAL DE GEOLOGIA, MINAS E HIDROCARBUROS, UNIVERSIDAD DE COSTA RICA, 1987, MINERAL RESOURCE ASSESSMENT OF THE REPUBLIC OF COSTA RICA: U.S. GEOLOGICAL SURVEY MISCELLANEOUS INVESTIGATION SERIES MAP I-1865, 75 P.
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