Geological map for Clarksburg (Marquette County, Michigan)
Hand-drawn map of Township 47 North, Range 28 West, NW quarter (Marquette County, Mich.). Accompanies descriptions in notebooks numbered 113, 118, 149, and 172. Colored drawings illustrate geological and natural features, including elevation and locations where geological samples were taken. Features include Lowmoor Lake and the D.S.S. & A. Railway.