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.

Letter from Harris L. Kempner to Heidi Evans sending congratulations on her recent marriage.

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.

Telegram sent by Ruth and Harris Kempner via Western Union to E. R. Thompson expressing congratulations.

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

Letter from I. H. Kempner to Harris K. Weston discussing about export of raw sugar and cotton planting plans.

Photograph of a L-15908 tree roller. It was a diesel-electric machine designed to quickly push down and crush trees. This model was used in Tournavista, Peru, a mission town founded by the LeTourneau Foundation, the charitable arm of the company.

Photograph of the Robert G. LeTourneau ship, stuck in mud in the Amazon River, 1954-06-13. The R.G. LeTourneau Foundation built a city on the headwaters of the Amazon River by clearing 990,000 acres it had been granted by the Peruvian government in exchange for building 31 miles of road through the Amazon rainforest.

Photograph of a group of unidentified men standing in front of a LeTourneau tree roller in Tournavista, Peru. The R.G. LeTourneau Foundation built this city on the headwaters of the Amazon River by clearing 990,000 acres it had been granted by the Peruvian government in exchange for building 31 miles of road through the Amazon rainforest.

Telegram sent by Harris Leon and Ruth Alma Kempner to Dr. Edward Randall and Henrietta Leonora Thompson congratulating them and expressing excitement for their return from Peru.