Dyfyniad APA

Society of Economic Geologists. (1959). Economic Geology,vol.54(1-4).

Dyfyniad Arddull Chicago

Society of Economic Geologists. Economic Geology,vol.54(1-4). Society of Economic Geologists, 1959.

Dyfyniad MLA

Society of Economic Geologists. Economic Geology,vol.54(1-4). 1959.

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