SOME ASPECTS OF GEOCHEMICAL EXPLORATION FOR PORPHYRY COPPER DEPOSITS IN PUERTO RICO.LEARNED RE.1977; CONFERENCE OF ASSOCIATION OF GEOSCIENTISTS FOR INTERNATIONAL DEVELOPMENT/1977/CARACAS; VEN; S.L.; DA. 1977; NO 35; 5 P.; BIBL. 2 REF.Conference Paper

THE SOLUBILITIES OF QUARTZ,QUARTZ-CINNABAR AND CINNABAR-STIBNITE IN SODIUM SULFIDE SOLUTIONS AND THEIR IMPLICATIONS FOR ORE GENESIS.LEARNED RE.1968; DISSERT. ABSTR. INTERNATION., B; USA; 1968(4), VOL. 28, NUM. 0010Miscellaneous

GOLD- A USEFUL PATHFINDER ELEMENT IN THE SEARCH FOR PORPHYRY COPPER DEPOSITS IN PUERTO RICOLEARNED RE; BOISSEN R.sdIN: GEOCHEM. EXPLOR. PROC. 4TH. INT. SYMP.; LONDON; 1972; LONDON INST. MIN. METAL. ,1973, P. 93 A 103Miscellaneous

MERCURY CONTENT OF ROCKS, SOILS, AND STREAM SEDIMENTS.PIERCE AP; BOTBOL JM; LEARNED RE et al.1970; GEOL. SURV. U.S.A., PROF. PAPER; USA; 1970, NUM. 0713, P. 14 A 16Miscellaneous

THE PARTITIONING OF COPPER AMONG SELECTED PHASE OF GEOLOGIC MEDIA OF TWO PORPHYRY COPPER DISTRICTS, PUERTO RICO = LA SEPARATION DU CUIVRE AU COURS DES DIFFERENTES PHASES PRESENTEES PAR LES MILIEUX GEOLOGIQUES DE DEUX DISTRICTS A PORPHYRY COPPER, PORTO RICOLEARNED RE; CHAO TT; SANZOLONE RF et al.1981; J. GEOCHEM. EXPLOR.; ISSN 0375-6742; NLD; DA. 1981; VOL. 15; NO 1-3; PP. 563-581; BIBL. 12 REF.; 4 TAB. ; TABL./ILL.Conference Paper

A GEOCHEMICAL RECONNAISSANCE OF THE UTUADO BATHOLITH AND VICINITY, PUERTO RICO = PROSPECTION GEOCHIMIQUE DE RECONNAISSANCE DU BATHOLITE DE UTUADO ET DE SON ENVIRONNEMENT, PORTO RICOLEARNED RE; HICKEY TH; PEREZ DE GONZALES ILEANA et al.1981; ; USA; DA. 1981; 6 SHEETS; BIBL. 7 REF.;[OPEN-FILE REP. (U. S. GEOL. SURV. 1978); ISSN 0196-1497; NO 81-1131]Serial Issue