My Sunday column described the disturbance of an Indian mound at the east end of Lake Minnetonka, despite the area having been mapped as an archaeological site as early as 1883. Below is a map of the so-called Shaver Mounds included in a 1911 book, the Aborigines of Minnesota, digitized in Google Books and, as a pre-1922 work, in the public domain. Virtually all of the marked features in this map have been destroyed over the years.

Correction: In the print version of my column, and early digital versions, a photo by the Office of the State Archaeologist of a geomorphologist on the site in 2010 was incorrectly credited to me.