Dyfyniad APA

Society of Economic Geologists. (1926). Economic Geology Vol.21 Nos.1-8.

Dyfyniad Arddull Chicago

Society of Economic Geologists. Economic Geology Vol.21 Nos.1-8. Economic Geology Publishing Co, 1926.

Dyfyniad MLA

Society of Economic Geologists. Economic Geology Vol.21 Nos.1-8. 1926.

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