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ACKNOWLEDGMENTS.
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    • Contributions to Mineralogy, No. 54; (with Crystallographic Notes by S. L. Penfield.9 pp.—Am. Jour. Sci., Nov., 1892.
    • On Penfieldite, a new species.1 pp.—Am. Jour. Sci., Sept., 1892.
    • Mineralogische Mittheilungen, by F. A. Genth (with Crystallographic Notes by S. L. Penfield).10 pp. Ill.—"Zeit. für Krystallog." XVIII, 6, (1891).
    • Examination of the North Carolina Uranium Minerals.7 pp.—Am. Chem. Jour. Vol. I, Nos. 2 and 3.
    • On some American Vanadium Minerals.6 pp.—Am. Jour. Sci., July, 1876.
    • On an undescribed Meteoric Iron from East Tennessee.4 pp., 2 pl.—Proc. Acad. Nat. Sci. Phila., Dec. 28, 1886.
    • Lansfordit, ein neues Mineral, 2 pp.
    • On the Vanadates and Iodyrite, from Lake Valley, Sierra Co., New Mexico.13 pp.Read before Am. Phil. Soc'y Apr. 17, 1885.
    • Contributions to Mineralogy.—Am. Jour. Sci., Sept. 1859; March, 1862, May, 1868.
    • Meteorology.6 pp.
    • Meteorology.4 pp.—Am. Jour. Sci., Nov., 1861.
    • Re-examination of the Tetradymite from Field's Gold Mine, Georgia.
    • On Pyrophyllite from Schuylkill Co., Penn.Read before Am. Phil. Soc'y, July 18, 1878.
    • Mineralogische Mittheilungen.31 pp., 2 pl.—Zeit. für Krystallographie, 1885.
    • Jarosite from Utah.1 p.—Am. Jour. Sci., Jan., 1890.
    • On Two Minerals from Delaware Co., Pa.3 pp.—Proc. Acad. Sci. of Phila., 1889.
    • Contributions from the Laboratory of the University of Pennsylvania.
  • Gilbert, G. K.
    • The Colorado Plateau Region considered as a Field for Geological Study.27 pp.—Am. Jour. Sci., July and August, 1876.
    • The Strength of the Earth's Crust.5 pp.—Bull. Geol. Soc. Am. Vol. I, 1889.
    • The History of the Niagara River.24 pp., 8 pl.—Sixth An. Rept. of Com. of State Reservation at Niagara, 1889.
    • The Work of the International Congress of Geologists.22 pp.—Am. Jour. Sci., Dec., 1887.
    • The Sufficiency of Terrestial Rotation for the Deflection of Streams.6 pp.—Nat. Acad. Sci., 1884.
  • Gordon, C. H.
    • Observations on the Keokuk Species of Agaricocrinas.7 pp., 1 pl.—Am. Geol., May, 1890.
    • On the Brecciated Character of the St. Louis Limestone.9 pp., 2 pl.—Am. Nat., April, 1890.
    • Proceedings of the Iowa Academy of Sciences for 1887, 1889, 1889.101 pp.
    • Quarternary Geology of Keokuk, Iowa, with Notes on the Underlying Rock Structure.8 pp., 2 pl.
  • Grant Uly. S.
    • Notes on the Molluscan Fauna of Minnesota.4 pp.—16th An. Rept. Geol. and Nat. Hist. Survey, Minn. (1887).
    • Account of a Deserted Gorge of the Mississippi near Minnehaha Falls.6 pp., 1 pl.
    • Conchological Notes.12 pp.—14th An. Rept. Geol. and Nat. Hist. Survey, Minn.
    • The Stratigraphical Position of the Ogishke Conglomerate of Northeastern Minnesota.8 pp.—Am. Geol. Vol. X, July, 1892.
    • Report of Geological Observations made in Northeastern Minnesota during the Summer of 1888.67 pp.—Geol. and Nat. Hist. Survey of Minn.; part IV. 17th An. Rept.
  • Hall, C. W.
    • Notes on a Geological Excursion into Central Wisconsin.18 pp., 1 pl.
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