382 BIBLIOGRAPHY AND CARTOGRAPHY

LAND OFFICE. Map of the United States and Territories showing
the extent of Public Surveys etc. General Land Office 1874.

Scale 40 miles to an inch. (Peabody.)

1875.

HALL, JAMES. Map illustrating the Paper on the Relations of the
Niagara and Lower Helderberg Formations and their Geographical
Distribution. (1874).

28th Rept, N. Y. State Museum. Albany, 1875.

22x22, colored to represent Niagara, Onondago and L. Helderberg. Scale about 55
miles to an inch. (J. H. U.)

HITCHCOCK & BLAKE. Die Steinkohlen felder der Yereinigten
Staaten von N. A., nach der Karte von Hitchcock und Blake. Maas-
tab. 1:13,500,000.

Petermann's Mitth. 4°, vol. xxi, 1875, pl. xvi.

7 5/8x9 7/8, coal areas colored. Scale 1/13500000. (J. H. U.)

ISLER, JOHN B. Map of Caroline County, Maryland. Phila. (?)
1875. Copyright 1873.

61x36 3/4, outline, drainage districts. Scale 1 5/8 inches to mile. (Peabody.)

1876.

BOYD, E. F. Geological Map of the United States.
Trans. North of Eng. Inst. Mining Eng., vol. xxv, plate xliii, p. 188.
Newcastle-upon-Tyne, 1876.

Rough map based on Hitchcock and Blake, 1874. (Marcou.)

———— Map of the Coal fields of the United States.

Idem., plate xliv. (Marcou.)

BRADLEY, F. H. Geological chart of the United States East of the
Eocky Mountains and of Canada. New Haven 1875.

Black etching. (Marcou.)

GRAY, FRANK A. Maryland, Delaware and the District of Co-
lumbia.

The National Atlas. Phila., 1885.

64x40 cm., colored, counties, hachures, towns. Scale 10 miles to an inch. (J. H. U.)

HITCHCOCK, C. H., and BLAKE, W. P. Geological map of the
United States.

Accompanying special report of the Smithsonian Institution for the
Centennial. Washington, 1876.

See authors, 1874. (Marcou.)