2 p. This series includes circulars and announcements that were designed to inform the public
in the Survey’s early days of its plans, activities, and needs. Few copies of each
Circular 6. Hydrology and water powers.
The Geological and Natural History Survey of Minnesota.
Retrieved from the University of Minnesota Digital Conservancy,
Content distributed via the University of Minnesota's Digital Conservancy may be subject to additional license and use restrictions applied by the depositor.