[Gt. Brit. Directorate of] Overseas Geological Surveys. Mineral Resources Division. Statistical summary of the mineral industry. H. M. Staty. Off.
Dyfyniad Arddull Chicago[Gt. Brit. Directorate of] Overseas Geological Surveys. Mineral Resources Division. Statistical Summary of the Mineral Industry. London: H. M. Staty. Off.
Dyfyniad MLA[Gt. Brit. Directorate of] Overseas Geological Surveys. Mineral Resources Division. Statistical Summary of the Mineral Industry. H. M. Staty. Off.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.