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Catalogue persistent identifier
APA
Learned, Robert Eugene & Pierce, H. A. (Herbert A.), 1951- & Perez de Gonzalez, Ileana & Geological Survey (U.S.). (1992). Analytical results and sample locality map of soil samples from the Tanama-Helecho porphyry copper district, Municipios of Utuado and Adjuntas, Puerto Rico [microform] / by Robert E. Learned, Herbert A. Pierce, Ileana Pâerez. [Menlo Park, Calif.?] : [Denver, Colo. : U.S. Dept. of the Interior, Geological Survey ; Books and Open-File Reports Section, distributor
MLA
Learned, Robert Eugene and Pierce, H. A. (Herbert A.), 1951- and Perez de Gonzalez, Ileana and Geological Survey (U.S.). Analytical results and sample locality map of soil samples from the Tanama-Helecho porphyry copper district, Municipios of Utuado and Adjuntas, Puerto Rico [microform] / by Robert E. Learned, Herbert A. Pierce, Ileana Pâerez U.S. Dept. of the Interior, Geological Survey ; Books and Open-File Reports Section, distributor [Menlo Park, Calif.?] : [Denver, Colo. 1992
Australian/Harvard
Learned, Robert Eugene & Pierce, H. A. (Herbert A.), 1951- & Perez de Gonzalez, Ileana & Geological Survey (U.S.). 1992, Analytical results and sample locality map of soil samples from the Tanama-Helecho porphyry copper district, Municipios of Utuado and Adjuntas, Puerto Rico [microform] / by Robert E. Learned, Herbert A. Pierce, Ileana Pâerez. U.S. Dept. of the Interior, Geological Survey ; Books and Open-File Reports Section, distributor [Menlo Park, Calif.?] : [Denver, Colo.
Wikipedia
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{{Citation | title=Analytical results and sample locality map of soil samples from the Tanama-Helecho porphyry copper district, Municipios of Utuado and Adjuntas, Puerto Rico [microform] / by Robert E. Learned, Herbert A. Pierce, Ileana Pâerez | author1=Learned, Robert Eugene | author2=Pierce, H. A. (Herbert A.), 1951- | author3=Perez de Gonzalez, Ileana | author4=Geological Survey (U.S.) | year=1992 | publisher=U.S. Dept. of the Interior, Geological Survey ; Books and Open-File Reports Section, distributor | language=English }}