The Gabbros and Associated Rocks in Delaware; The Greenstone Schist Areas of the Menominee and Marquette Regions of Michigan; The Gneisses, Gabbro-Schists, and Associated Rocks of Southwestern Minnesota.

Washington, D.C. United States Geological Survey. Three articles with plates, bound in contemporary cloth, published in 1890 and 1899, pp 45 (with folding map of Gabbro Area), 241 (with plates (some in colour) and text illus.), 131 plus plates (some plates in colour). Title to spine: Some American Greenstones Etc. Cloth flecked, previous owner's inscription fep, annotation one page, good condn. Item #90824

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