Search
Now showing items 1-5 of 5
Minnesota twin crystals
(St. Croix Rockhounds, Stillwater, MN, 1989)
Minnesotaite
(St. Croix Rockhounds, Stillwater, MN, 1990)
Minnesota kimberlites
(St. Croix Rockhounds, Stillwater, MN, 1991)
Minerals of the Bronk Quarry, near Winona, Minnesota
(St. Croix Rockhounds, Stillwater, MN, 1990)
Old lead mines of Southeastern Minnesota
(St. Croix Rockhounds, Stillwater, MN, 1988)