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44. Bibliography of North American Geology for 1888, by Nelson H. Darton. 1887. 8°. 35 pp. 

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45. The Present Condition of Kiiowledgn of the Geology of Texas, by Robert T. Hill. 1887 8^ 

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17. Analyses of Waters of the Ycdlowstonc National Park, with an Aceoimt of the Methods of 

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4.S. On the Form ami Position of the Sea Level, by Robert .Simpson Woodward. 1888. 8'^. 88 

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4'J. Latitudes and Longitudes of Certain Points in Missouri, Kansas, and New Mexico, by Robert 

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51. On Invertebrate Fossils from the Pacific Coast, by Charles Abiathar White. 1X89. ,s 103 

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57. .V Geological Reconnoissance in Southwestern Kansas, by Robert I lav. 1890. 8' 19 no 

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58. The Glacial ISoundiiry in Western Pennsylv.ania, Ohio, Kentucky, In<liana, and Illinois, by 

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63. A liibliography of Paleozoic Crustacea from 1698 to 1X89, including a list of .\ortli Amer- 

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64. A Report of work done in the Division of Chemistry and Phvsics. mainly during the fiscal 

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65. Stratigraphy of the liitiiminous Coal I'ield of Penns\ Ivania, Ohio, and W'est Virginia, by 

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66. On a Group of Volcanic Rocks from the Tewau Mountains, New Mexico, and on the occur- 

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67. The relations of the Traps of the Newark System in the New Jersey Region, by Nelson 

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68. Earth(iuakes in California in 1889, l>y James Edward Keeler. 1890. 8-. 25 i)p. Price 5 

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69. A Classed and Annotated Biography of Fossil Insects, by Samuel Howard Semlder. 1890. 

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70. .V Report on Astronomical Work of 1XX9 and 1890. by Robert Simi)Son WoodNvanl. 1890. 8- 

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71. Index to the Kiu)wn Fossil Insects of the World, including >h riapods .and Arachnids by 

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72. Altitudes between Lake Superior and the Rockv .Mountains, by Wairen Fpliam. 1891 8^' 

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73. The Viscosity of .Solids, by Carl Barns, 1891. 8-, xii, 139 pp. ]il. Price 15 cents, 



74. The Minerals of North Caroliim, by Frederick Augustus Genth, 1X91. x, 119 up Price 

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75. Record of North American Geidogy for 1887 to 1889, inclusive, by Xel.son Horatio Darton. 

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76. A Dictionary of Altitudes in the Fuited States (.sei'ond eilition), .■ompiled by Henry Gannett, 

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