Report discussing earthquake activity in the United States during 1947. The report is broken down by regions and has sections for specific earthquakes.

Report discussing earthquake activity in the United States during 1951. The report is broken down by regions and has sections for specific earthquakes.

Report discussing earthquake activity in the United States during 1952. The report is broken down by regions and has sections for specific earthquakes.

Report discussing earthquake activity in the United States during 1958. The report is broken down by regions and has sections for specific earthquakes.

Report discussing earthquake activity in the United States during 1954. The report is broken down by regions and has sections for specific earthquakes.

Introduction: From the inception of the effort to utilize atomic energy Perú has been of interest as a possible source of radioactive raw materials because of its great variety and abundance of metals. Because of this and a desire at that time to develop additional supplies of uranium, a cooperative program to search for uranium deposits was initiated in 1953 by the Junta and the USAEC.

Computer printout listings of three data tables (Digitized Accelerogram, Recording Station, and Earthquake) organized alphabetically by country.

Introduction: The specific purpose of the work was to learn whether the selenium indicated by the presence of Astragalus g. was uniformly distributed in one or more formations, i.e., probably syngenetic, or whether it was spatially and, therefore genetically, related to alteration.

Introduction: The writer visited the Sayapullo mine May 14 and 15, 1959, for comparative orientation, study of the uranium occurrence, and observation of alternation-metallization relations.

Abstract: In 1957 uranium was discovered in the Vilcabamba district on the north flank of the Cordillera Vilcabamba, part of the Cordillera Oriental. This district contains principally small copper-nickel veins. Small lenses of uraninite occur in calcite veins cutting Permian Copacabana limestone. Uranium is most abundant marginal to centers of strongest copper-nickel mineralization. Leaching and oxidation are virtually absent because of Pleistocene glaciation. Four separate areas in which uranium has been identified are Huamanapi, Calderon, Minasmayo, and Negrillas. The Puntarayoc area, near Pampaconas, is considered a separate district. The deposits have been tested by trenching, drilling, and sampling concurrently with geologic reconnaissance mapping of the surrounding region.

Discussing evidence of the potential of uranium in Peru

Descriptions of the geology of Peru

Discussing the occurrence of uranium at the Colquijirca Mine, located in Peru