II ADVERTISEMENT. 



1-653 pp., 105 pi. and maps ; i-v, 1-861 pp., 118 pi. and maps ; i-x, 1-756 pp., 102 pi. and maps : i-sii, 

 1-642 pp., 1 pi. ; 643-1400 pp. 



XIX. Niuetnenth Annual Report of the United States Geological Survey, 1897-'98, Charles D 

 Walcott, Director. 1898. (Parts II, III, and V, 1899.) 8". 6 pt. in 7 vol. 422 pp., 2 maps; v, 95S 

 pp., 172 pi. and maps; v, 785 pp., 99 pi. and maps; viii, 814 pp., 118 pi. and maps; xvii, 400 pp., 110 

 pi. and maps; viii, 651 pp,, 11 j)l. ; viii, 706 pp. 



XX. Twentieth Annual Report of the United States Geological Survey, 1898-99, Charles D 

 Walcott, Director. 1899. (Parts II, III, IV, V, and VII, 1900.) 8°. 7 pt. in 8 vol. 551 pp., 2 maps; 

 V, 953 pp., 193 pi. and maps; v, 595 pp., 78 pi. and maps; vii, 660 pp., 75 pi. and maps; xix, 498 pp., 

 159 pi. and maps ; viii, 616 pp. ; xi, 804 pp., 1 pi. ; v, 509 pp., 38 pl. and maps, 



MONOGRAPHS. 



I. Lake Bonneville, by Grove Karl Gilbert. 1890. 4°. xx, 438 pp. 51 pl. 1 map. Price $1.50. 



II. Tertiary History of the Grand Canou District, with Atlas, by Clarence E. Dutton, Capt., U. S. A. 

 1882. 4°. xiv, 264 pp. 42 pl. and atlas of 24 sheets folio. Price $10.00. 



III. Geology of the Comstock Lode and the Washoe District, with Atlas, by George F. Becker. 

 1882. 4°. XV, 422 pp. 7 pl. and atlas of 21 sheets folio. Price $11.00. 



IV. Comstock Mining and Miners, by Eliot Lord. 1883. 4'^. xiv, 451 jip. 3 pl. Price $1.50. 

 v. The Copper-Bearing Rocks of Lake Superior, by Roland Duer Irving. 1883. 4°. xvi, 464 



pp. 151. 29 pl. and maps. Price $1.85. 



VI. Contributions to the Knowledge of the Older Mesozoic Flora of A^irginia, by William Morris 

 Fontaine. 1883. 4°. xi, 144 pp. 54 1. 54 pl. Price $1.05. 



VII. Silver-Lead Deposits of Eureka, Nevada, by Joseph Storv Curtis. 1884. 4°. xiii, 200 pp. 

 16 pl. Price $1.20. 



VIU. Paleontology of the Eureka District, by Charles Doolittle Walcott. 1884. 4°. xiii, 298 

 pp. 24 1. 24 pl. Price $1.10. 



IX. Brachiopoda and Lamellibranchiata of the Raritan Clays and Greensaud Marls of New 

 Jersey, by Robert P. AVhitfield. 1885. 4^. xx, 338 pp. 35 pl. 1 map. Price $1.15. 



X. Dinocerata. A Monograph of an Extinct Order of Gigantic Mammals, by Othniel Charles 

 Marsh. 1886. 4°. xviii, 243 pp. 56 1. 56 pl. Price $2.70. 



XI. Geological History of Lake Lahontau, a Quaternary Lake of Northwestern Nevada, by 

 Israel Cook Russell. 1885. 4°. xiv, 288 pp. 46 pl. and maps. Price $1.75. 



XII. Geology and Mining Industry of Leadville, Colorado, with Atlas, by Samuel Franklin 

 Emmons. 1886. 4^\ xxix, 770 pp. 45 pl. and atlas of 35 sheets folio. Price $8.40. 



XIII. Geology of the Quicksilver Deposits of tlie Pacific Slope, with Atlas, bv George F. Becker. 

 1888. 4'='. xix, 486 pp. 7 pl. and atlas of 14 "sheets folio. Price $2.00. 



XIV. Fossil Fishes and Fossil Plants of the Triassic Rocks of New .Jersev and the Connecticut 

 Valley, by John S. Newberry. 1888. i"". xiv, 152 pp. 26 pl. Price $1.00. 



XV. The Potomac or Younger Mesozoic Flora, by William Morris Fontaine. 1889. 4'^, xiv, 

 377 pp. 180 pl. Text and plates bound separately. Price $2.50. 



XVI. The Paleozoic Fishes of North America, by John Strong Newberry. 1889. 4°. 340 pp. 

 53 pl. Price $1.00. 



XVII. The Flora of the Dakota Group, a Posthumous Work, bv Leo Lesquereux. Edited by 

 F. H. Knowlton. 1891. 4°. 400 pp. 66 pl. Price $1.10. 



XVIII. Gasteropoda and Cephalopoda of the Raritan Clays and Greensaud Marls of New Jersey, 

 by Robert P. Whitfield. 1891. 4°. 402 pp. .50 pl. Price $1.00. 



XIX. The Peuokee Iron-Bearing Series of Northern Wisconsin and Michigan, by Roland D. 

 Irving and C. R. Van Hise. 1892. 4". xix, 534 pp. Price $1.70. 



XX. Geology of the Eureka District, Nevada, with an Atlas, by Arnold Hague. 1892. i". xvii, 

 419 pp. 8 pl. Price $5.25. 



XXI. The Tertiarv Rhynchophorous Coleoptera of the United States, by Samuel Hubbard Scud- 

 der. 1893. 4°. xi, 206 pp." 12 pl. Price 90 cents. 



XXII. A Manual of Topographic Methods, by Henry Gannett, Chief Topographer. 1893. 4". 

 xiv, 300 pp. 18 pl. Price $1.00. 



XXIII. Geology of the Green Mountains in Massachusetts, by Raphael Pumpelly, T. Nelson Dale, 

 and J. E. Wolff. 1894. 4°. xiv, 206 pp. 23 pl. Price $1.30. 



XXIV. MoUusca and Crnstaeea of the Miocene Formations of New Jersey, by Robert Parr Whit- 

 field. 1894. 4°. 193 pp. 24 pl. Price 90 cents. 



XXV. The Glacial Lake Agassiz, by Warren Upham. 1895. 4-. xxiv, 658pp. 38 pl. Price$1.70. 



XXVI. Flora of the Amboy Clavs, by .Tohn Strong Newberry ; a P sthumous Work, edited by 

 Arthur HoUick. 1895. 4'-\ 260 pp. 58 pl. Price $1.00. 



XXVII. Geoloiiy of the Denver Basin in Colorado, by Samuel Franklin Emmons, Whitman Cross, 

 and George Romans Eldridge. 1896. 4=. 556 pp. 31 pl. Price $1..50. 



XXVIII. The Marquette Iron-Bearing District of Michigan, with Atlas, by C. R. Van Hise and 

 W. S. Bayley, including a Chapter on the Republic Trough, by H. L. Smyth. 1895. 4°. 608 pp. 35 

 pl. and atlas of 39 sheets folio. Price $5.75. 



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

 Hampdeu Counties, bv Ben iamin Kendall ICmerson. 1898. 4°. xxi, 790 pp. 35 pl. Price $1.90. 



XXX. Fossil Medusic, by Charles Doolittle Walcott. 1898. i^. ix, 201 pp. 47 pl. Price $1.50. 



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

 1898. 4-. XXXV, 260 pp. 43 pl. and atlas of 30 sheets folio. Price $3.60. 



