Cofnodi Dyfyniadau

Dyfyniad APA
Leverett Frank. (1929). Map showing areas formerly covered by glacial lakes of Northern Minnesota, Northern Wisconsin, and Northern Peninsula of Michigan. U. S. Geological Survey.
Dyfyniad Arddull Chicago
Leverett Frank. Map Showing Areas Formerly Covered by Glacial Lakes of Northern Minnesota, Northern Wisconsin, and Northern Peninsula of Michigan. U. S. Geological Survey, 1929.
Dyfyniad MLA
Leverett Frank. Map Showing Areas Formerly Covered by Glacial Lakes of Northern Minnesota, Northern Wisconsin, and Northern Peninsula of Michigan. U. S. Geological Survey, 1929.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.