Результаты поиска - Conference on Small Scale Mining

Wokim gold long Morobe, 1922-1942 / по Kuluah, Albert

“...Conference on Small Scale Mining...”

Proceedings of the Conference on Small Scale Mining in Papua New Guinea, held at the University of Technology, Lae, 4th-8th June, 1983

“...Conference on Small Scale Mining in Papua New Guinea (1983 : University of Technology, Lae)...”

Small-scale mining : a global overview /

“...International Conference on Small-scale Mining...”