About the author: Warren Dupré Smith (May 12, 1880 — July 18, 1950), worked in the Division of Mines, Bureau of Science, insular government of the Philippines. and the author of numerous studies and reports.
About the author: Warren Dupré Smith (May 12, 1880 — July 18, 1950), worked in the Division of Mines, Bureau of Science, insular government of the Philippines. and the author of numerous studies and reports.