E'ac^inn.g' Co., of postage to any one in any part of the world who will fur- Scientific Works ; but we can furnish nish his address. joHND. CHEEVEP., Dep'yTreas. Warehousn, 15 Park Row, opp. Astor House, N. Y. books on any desired subject, on receipt Branches: 308Chestnut Street, Phila., 167and… … THE ANTHRACITE COAL FIELDS THE VAPORS OF METALS.—A PA- Science Series,—For Students in Science and of Pennsylvania.—By Chas. A. Ashburner. History, per by John Tiirry, treating of the spectroscopic exam- Art Classes, and Higher and Middle-class Schools. Topography, Structural Geology,…
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