II ADVERTISEMENT. 
MONOGRAPHS. 
I. Lake Bonneville, by Grove Karl Gilbert. 1890. 4°. xx, 438 pp. 51 pi. 1 map. Price $1.50. 
II. Tertiary History of the Grand Canon District, with Atlas, by Clarence E. Duttou, Capt. U. S. A. 
1882. 4°. xiv, 264 pp. 42 pi. 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 pi. and atlas of 21 sheets folio. Price $11.00. 
IV. Comstock Mining and Miners, by Eliot Lord. 1883. 4°. xiv, 451 pp. 3 pi. Price $1.50. 
V. The Copper-Bearing Rocks of Lake Superior, by Roland Duer Irving. 1883. 4°. xvi, 464 pp. 
151. 29 pi. and maps. Price $1.85. 
VI. Contributions to the Knowledge of the Older Mesozoic Flora of Virginia, by William Morris 
Fontaine. 1883. 4°. xi, 144 pp. 54 1. 54 pi. Price $1.05. 
VII. Silver-Lead Deposits of Eureka, Nevada, by Joseph Story Curtis. 1884. 4°. xiii, 200 pp. 16 
pi. Price $1.20. 
VIII. Paleontology of the Eureka District, by Charles Doolittle Walcott. 1884. 4°. xiii, 298 pp. 
24 1. 24 pi. Price $1.10. 
IX. Brachiopoda and Lamellibranchiata of the Raritan Clays and Greensand Marls of New Jersey, 
by Robert P. Whitfield. 1885. 4°. xx, 338 pp. 35 pi. 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 pi. Price $2.70. 
XI. Geological History of Lake Lahontan, a Quaternary Lake of Northwestern Nevada, by Israel 
Cook Russell. 1885. 4°. xiv, 288 pp. 46 pi. 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 pi. and atlas of 35 sheets folio. Price $8.40. 
XIII. Geology of the Quicksilver Deposits of the Pacific Slope, with Atlas, by George F. Becker. 
1888. 4°. xix, 486 pp. 7 pi. and atlas of 14 sheets folio. Price $2.00. 
XIV. Fossil Fishes and Fossil Plants of the Triassic Rocks of New Jersey and the Connecticut Val- 
ley, by John S. Newberry. 1888. 4°. xiv, 152 pp. 26 pi. Price $1.00. 
XV. The Potomac or Younger Mesozoic Flora, by William Morris Fontaine. 1889. 4°. xiv, 377 
pp. 180 pi. Text and plates bound separately. Price $2.50. 
XVI. The Paleozoic Fishes of North America, by John Strong Newberry. 1889. 4°. 340 pp. 53 pi. 
Price $1.00. 
XVII. The Flora of the Dakota Group, a Posthumous Work, by Leo Lesquereux. Edited by F. H 
Knowlton. 1891. 4°. 400 pp. 66 pi. Price $1.10. 
XVIII. Gasteropoda and Cephalopoda of the Raritan Clays and Greensand Marls of New Jersey, 
by Robert P. Whitfield. 1891. 4°. 402 pp. 50 pi. Price $1.00. 
XIX. The Penokee Iron-Bearing Series of Northern Wisconsin and Michigan, by Roland D. Irving 
andC.R. Van Hise. 1892. 4°. xix, 534 pp. 37 pi. Price $1.70. 
XX. Geology of the Eureka District, Nevada, with Atlas, by Arnold Hague. 1892. 4°. xvii, 419 pp. 
£pl. Price $5.25. 
XXI. The Tertiary Rhynchophorous Coleoptera of North America, by Samuel Hubbard Scudder. 
1893. 4°. xi, 206 pp. 18 pi. Price 90 cents. 
XXII. A Manual of Topographic Methods, by Henry Gannett, Chief Topographer. 1893. 4°. xiv, 
300pp. 18 pi. Price $1.00. 
XXIII. Geology of the Green Mountains in Massachusetts, by Raphael Pumpelly, J. E. Wolff, 
and T. Nelson Dale. 1894. 4°. xiv, 206 pp. 23 pi. Price $1.30. 
XXIV. Mollusca and Crustacea of the Miocene Formations of New Jersey, by Robert Parr Whitfield. 
1894. 4°. 195 pp. 24 pi. Price 90 cents. 
XXV. The Glacial Lake Agassiz, by Warren Upham. 1895. 4°. xxiv, 658 pp. 38 pi. Price $1.70. 
XXVI. Flora of the Amboy Clays, by Jobn Strong Newberry; a Posthumous Work, edited by 
Arthur Hollick. 1895. 4°. 260 pp. 58 pi. Price $1.00. 
XXVII. Geology of the Denver Basin, Colorado, by S. F. Emmons, Whitman Cross, and George H. 
Eldridge. 1896. 4°. 556 pp. 31 pi. 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. 1897. 4°. 608 pp. 35 pi. 
and atlas of 39 sheets folio. Price $5.75. 
XXIX. Geology of Old Hampshire County, Massachusetts, comprising Franklin, Hampshire, and 
Hampden Counties, by Benjamin Kendall Emerson. 1898. 4°. xxi, 790 pp. 35 pi. Price 
XXX. Fossil Medusa;, by Charles Doolittle Walcott. 1898. 4°. ix, 201 pp. 47 pi. Price $1.50. 
In preparation : 
XXXI. Geology of the Aspen Mining District, Colorado, with Atlas, by Josiah Edward Spurr. 
XXXII. Geology of the Yellowstone National Park, Part II, Descriptive Geology, Petrography, and 
Paleontology, by Arnold Hague, J. P. Iddings, W. Harvey Weed, Charles D. Walcott, G. H. Girty, T. W. 
Stanton, and F. H. Knowlton. 
XXXIII. Geology of the Narragansett Basin, by N. S. Shaler, J. B. Woodworth, and August F. 
Foerste. 
