Dyfyniad APA

Society of Economic Geologists. (1920). Economic Geology Vol.15 Nos.1-8.

Dyfyniad Arddull Chicago

Society of Economic Geologists. Economic Geology Vol.15 Nos.1-8. Economic Geology Publishing Co, 1920.

Dyfyniad MLA

Society of Economic Geologists. Economic Geology Vol.15 Nos.1-8. 1920.

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