Filter by map area
This map only shows samples that we were able to locate to a one-square-mile section of the Public Land Survey System within Minnesota, Michigan, or Wisconsin. Samples from Ontario appear in the table below, but not on the map. There may be additional location information in the scanned field notebooks. 
Select by rectangle
Select by polygon
Clear map selectionFilter by content
Use an underscore (_) as a wildcard for exactly one character or a percent sign (%) to indicate any number of characters
