Hänvisningar gällande denna post

APA-referens (7:e uppl.)
Estados Unidos Geological Survey. (1928). General geologic map and sections of the Keweenawan and associated rocks in the lake superior copper district. U. S. Geological Survey.
Chicago-referens (17:e uppl.)
Estados Unidos Geological Survey. General Geologic Map and Sections of the Keweenawan and Associated Rocks in the Lake Superior Copper District. U. S. Geological Survey, 1928.
MLA-referens (9:e uppl.)
Estados Unidos Geological Survey. General Geologic Map and Sections of the Keweenawan and Associated Rocks in the Lake Superior Copper District. U. S. Geological Survey, 1928.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.