publications: monographs. 131 
XIX. The Penokee iron-bearing series of northern Wisconsin and Michigan, 
by R. D. Irving and C. P. Van Hise. 1892. 4°. xix, 534 pp., 37 pis. 
Price, $1.70. 
XX. Geology of the Eureka district, Nevada, with an atlas, by Arnold Hague. 
1892. 4°. xvii, 419 pp., 8 pis. Price, $5.25. 
XXI. The Tertiary rhynchophorous Coleoptera of the United States, by S. H. 
Scudder. 1893. 4°. xi, 206 pp., 12 pis. Price, 90 cents. 
XXII. A manual of topographic methods, by Henry Gannett, chief topographer. 
1893. 4°. xiv, 300 pp., 18 pis. Price, $1. 
XXIII. Geology of the Green Mountains in Massachusetts, by Raphael Pumpelly, 
T. N. Dale, and J. E. Wolff. 1894. 4°. xiv, 206 pp., 23 pis. Price, 
$1.30. 
XXIA r . Mollusca and Crustacea of the Miocene formations of New Jersey, by 
R. P. Whitfield. 1894. 4°. 193 pp., 24 pis. Price, 90 cents. 
XXV. The Glacial Lake Agassiz, by Warren Upham. 1895. 4°. xxiv, 658 
pp., 38 pis. Price, $1.70. 
XXVI. Flora of the Amboy clays, by J. S. Newberry; a posthumous work, 
edited by Arthur Hollick. 1895. 4°. 260 pp., 58 pis. Price, $1. 
XXVII. Geology of the Denver Basin in Colorado, by S. F. Emmons, Whitman 
Cross, and G. H. Eldridge. 1896. 4°. 556 pp., 31 pis. 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 pis. and atlas of 39 
sheets folio. Price, $5.75. 
XXIX. Geology of old Hampshire County, Mass., comprising Franklin, Hamp- 
shire, and Hampden counties, by B. K. Emerson. 1898. 4°. xxi, 
790 pp., 35 pis. Price, $1.90. 
XXX. Fossil Medusa?, by C. D. Walcott. 1898. 4°. ix, 201 pp., 47 pis. 
Price, $1.50. 
XXXI. Geology of the Aspen mining district, Colorado, with atlas, by J. E. 
Spurr. 1898. 4°. xxxv, 260 pp., 43 pis. and atlas of 30 sheets folio. 
Price, $3.60. 
XXXII. Geology of the Yellowstone National Park, Part II, descriptive geology, 
petrography, and paleontology, by Arnold Hague, J. P. Iddings, W. 
H. Weed, C. D. Walcott, G. H. Girty, T. W. Stanton, and F. H. 
Knowlton. 1899. 4°. xvii, 893 pp., 121 pis. Price $2.45. 
XXXIII. Geology of the Narragansett Basin, by N. S. Shaler, J. B. Woodworth, 
and A. F. Foerste. 1899. 4°. xx, 402 pp., 31 pis. Price, $1. 
XXXIV. The glacial gravels of Maine and their associated deposits, by G. H. 
Stone. 1899. 4°. xiii, 499 pp. , 52 pis. Price, $1.30. 
XXXV. The later extinct floras of North America, by J. S. Newberry; edited by 
Arthur Hollick. 1898. 4°. xviii, 295 pp., 68 pis. Price, $1.25. 
XXXVI. The Crystal Falls iron-bearing district of Michigan, by J. M. Clements 
and H. L. Smyth; with a chapter on the Sturgeon River tongue, by 
W. S. Bayley, and an introduction by C. R. Van Hise. 1899. 4°. 
xxxvi, 512 pp., 53 pis. Price, $2. 
XXXVII. Fossil flora of the Lower Coal Measures of Missouri, by David White. 
1899. 4°. xi, 467 pp., 73 pis. Price, $1.25. 
XXXVIII. The Illinois glacial lobe, by Frank Leverett. 1899. 4°. xxi, 817 pp., 
24 pis. Price, $1.60. 
XXXIX. The Eocene and Lower Oligocene coral faunas of the United States, with 
descriptions of a few doubtfully Cretaceous species, by T. W. Vaughan. 
1900. 4°. 263 pp., 24 pis. Price, SI. 10. 
