About AIZAWA YOSHIO
About アフリカ研究
About mining industry
About gold deposit
About enterprise
About mine property
About mineral resource
About survey on actual situation
About recognition
About field study
About correlation
About United Republic of Tanzania
About relation
About interested persons
About small business
About Policy,system,organizations
About Job and function management in general
About タンザニア
About 鉱業
About アクター
About 鉱山地区
About 調査