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XXVIII. The Mar<iuette Iron-Bearing District of Michigan, with Atlas, l>y C. R. Van Hiso and W. 

 S. Bayley, incliulinjj a Chapter on the Ro]iublic Trough, by H. L. Smyth. 1897. 4°. 608 pp. 35 pi. 

 and atlas of 39 sheets folio. Trice $5.75. 



XXIX. Geology of Old Hampshire County, Massachusetts, comprising Franklin, Hampshire, and 

 Hampden Counties, by Jienjamin Kendall Emerson. 1898. 4°. xxi, 790 pp. 35 pi. Price .$l.nO. 



XXX. Fossiniodusa', by Charles Doolittlo Walcott. 1898. 4°. ix, 201 pp. 47 pi. Price .$1..'.0. 



XXXI. Geology of the Aspen Mining District, Colorado, with Atlas, by Josiah Edward Spurr. 1898. 

 4<'. XXXV, 260 pp. 43 pi. and atlas of 30 sheets folio. Price $3.60. 



XXXII. Geology of the Yellowstone Kational Park, Part II, Descriptive Geology, Petrography, 

 and Paleontology, by Arnold Hague, J. P. Iddings, W. Harvey Weed, Charles D. Walcott, G. H. Ciirty, 

 T. W. Stanton, and F. H. Knowlton. 1899. 4^. xvii, 893 pp. 121 pi. Price $2.45. 



XXXIII. Geology of the Xarragansett Basin, by N. S. Shaler, J. B. "Woodworth, and August P. 

 Foerste. 1899. 4°. xx,402pp. 31 pi. Price $1. 



XXXIV. The Glacial Gravels of Maine and their Associated Deposits, by George H. Stone. 1899. 

 4°. xiii, 499 pp. 52 pi. Price $1.30. 



XXXV. The Later Extinct Floras of North Amer'ca, by John Strong Newberry; edited by Arthur 

 Hollick. 1898. 4^\ xviii, 295 pp. 68 pi. Price $1.25. 



XXXVI. The Crystal Falls Iron-Bearing District of Michigan, by J. Morgan Clements and Henry 

 Lloyd Smyth; with a Chapter on the Sturgeon River Tongue, by William Shirley Bayley, and an 

 Introduction by Charles Richard Van Hise. 1899. 4°. xxxvi, 512 pp. 53 pi. Price $2. 



XXXVII. Fossil Flora of the Lower Coal Measures of Mis.souri, by David White. 1899. i'^. xi, 

 467 pp. 73 pi. Price $1.25. 



XXXVIII. The Illinois Glacial Lobe, by Frank Leverett. 1899. 4'\ xxi, 817 pp. 24 pi. I'rice $1.60. 



XXXIX. The Eocene and Lower Oligocene Coral Faunas of the LTnited States, with Descriptions 

 of a Few Doubtfully Cretaceous Species, by T. WaylaudVaughan. 1900. 4°. 263 pp. 24 pi. Price 

 $1.10. 



XL. Adephagous and Clavicorn Coleoi>tera from the Tertiary Deposits at P'lorissant, Colorado, with 

 Descriptions of a Few Other Forms and ii Systematic List of the Non-RIiyncophorous Tertiary 

 Coleoptera of North America, by Samuel Hubbard Scudder. 1900. 4°. 148 pp. 11 pi. Price 80 cents. 



In preparation : 

 — Flora of the Laramie and Allied Formations, by Frank Hall Knowlton. 



BULLETINS. 



1. On Hyperstheue-Andesite and on Triclinic Pyroxene in Augitic Rocks, by Whitman Cross, with a 

 Geological Sketch of Buflalo Peaks, Colorado, by S. F. Emmons. 1883. 8°. 42 pp. 2 pi. Price 10 cents. 



2. Gold and Silver Conversion Tables, giving the Coining Value of Troy ( Junces of Fine Metal, etc., 

 computed by Albert Williams, jr. 1883. 8°. 8 pp. Price 5 cents. 



3. On the Fossil Faunas of the Upper Devonian, along the Meridian of 16'^ 30', from Tompkins County, 

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4. On Mesozoic Fossils, by Charles A. White. 18.84. 8^. 36 pp. 9 pi. Price 5 cents. 



5 . A Dictionary of Altitudes in the United States, compiled by Henry Gannett. 1884. 8°. 325 pp. 

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6. Elevations m the Dominion of Canada, by J. W. Spencer. 1884. 8°. 43 pp. Price 5 cents. 



7. Mapoteca Geologica Americana. A Catalogue of Geological Maps of America (North and South), 

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8. On Secondarj^ Enlargements of Mineral Fragments in Certain Rocks, by R. D. Irving and C. R. 

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9. A Report of Work done in the Wasliiugton Laboratory during the Fiscal Year 1883-'84. F. W. 

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10. On the Cambrian Faunas of North America. Preliminary Studies, by Charles Doolittle Walcott. 

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11. On the Quaternary and Recent MoUusca of the Great Basin ; with Descriptions of New Forms, 

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12. A Crystallographic Study of the Thinolite of Lake Lahontan, by Edward .S. Dana. 1884. 8°. 

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14. The Electrical and Magnetic Pro})ertie8 of the Iron Carburets, by Carl Barns and Vincent 

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15. On the Mesozoic and Cenozoic Paleontology of California, by Charles A. White. 1885. 8°. 33 pp. 

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16. On the Higher Devonian Faunas of Ontario County, New Vork, by John il. Clarke. 1885. 8°. 

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