Saikou

Saikou

Saikou tekiyou

Saikou yakin kankei yougo genan

Beikoku saikou houki

Kouzan hoan jitsugi shiryou : dai 3kai saikou kenkyuukai teishutsu shiryou

Saikougaku

Saikougaku

Saikougaku

Saikougaku

Saikougaku

Saikougaku

Saikougaku

Saikougaku

Saikougaku

Saikougaku

採鉱資料

開採鉄鉱鉱区図

Sakou saishuhou

Saikougaku zensho : tankou shoukei

Coal Miner (Entering the Mountain to Mine the Coal)

Saikouhou chousa houbun

Saikouhou chousa houbun

貴鉱石と採掘熱 : タングスデン鉱の将来

Kougyou jourei sakou saishuhou shikou saisoku