(1993). Map showing the thickness and character of quaternary sediments in the glaciated United States east of the Rocky Mountains, Northeastern states, the Great Lakes, and parts of Southern Ontario and the atlantic offshore area (east of 803̊1' West longitude). U.S. Geological Survey.
Chicago-Zitierstil (17. Ausg.)Map Showing the Thickness and Character of Quaternary Sediments in the Glaciated United States East of the Rocky Mountains, Northeastern States, the Great Lakes, and Parts of Southern Ontario and the Atlantic Offshore Area (east of 803̊1' West Longitude). Denver, CO: U.S. Geological Survey, 1993.
MLA-Zitierstil (9. Ausg.)Map Showing the Thickness and Character of Quaternary Sediments in the Glaciated United States East of the Rocky Mountains, Northeastern States, the Great Lakes, and Parts of Southern Ontario and the Atlantic Offshore Area (east of 803̊1' West Longitude). U.S. Geological Survey, 1993.