About SIMS P K
About U.S. Geological Survey, Colorado
About JAMES H L
About U.S. Geological Survey, Washington
About Economic Geology-Bulletin of the Society of Economic Geologists
About Proterozoic Era
About Egypt
About Metallic ore deposit
About エジプト
About 砂ばく
About 原生代
About しま
About 鉄鉱層
About 地質
About 環境