Browsing William S. Cordua, Ph.D by Subject "Asteroids"

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Agate hunters point way to an impact crater

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 1998)
Peridot asteroid

Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 2000)