The diamond fields of Venezuela. John C. Davey 1948. Barncoose Terrace, Redruth, Cornwall, England, 1948. Engineering and Mining. All my gratitude to professor Dr. Franco Urbani Patat for sharing this historic paper You can download complete PDF version at / Puedes bajar la versión completa en PDF en: https://mariantoc.github.io/minerals.html#DaveyJC1948