368 BIBLIOGRAPHY AND CARTOGRAPHY

Map B (Topographical map of Montgomery county.)

Ann. Rept, of the Geologist of Maryland, 1837.
19x12, hachured, geological remarks. Scale 1:120000, or 1.9 miles to an inch.
(Peabody.)

DOUGLAS, D. B.

Report on the coal and iron formation of Frostburg (etc.). Brooklyn (?),
1838.

LOOMIS, E. Magnetic Chart of the United States.
Amer. Jour. Sci., vol. xxxiv, 1838, opposite p. 290. Gives lines of equal
declination and dip.

1840.
ALEXANDER, J. H. (Topographic map of Maryland) manuscript.

79x41 contoured 50 east and 100 feet west of the Monocacy. Scale l:2000000.
(Williams.)

ALEXANDER, J. H., and DUCATEL, J. T. Map A (Topographic map
of Frederick County).

Accompanying Ann. Rept. of the Geologist of Maryland, 1839.
13 1/2x10 5/8, hachure, geological remarks. Scale 1:20000. (Peabody.)

———— Map B (Topographic map of Harford, Baltimore and part
of Carroll counties).

Accompanying Ann. Rept. of the Geologist of Maryland, 1839.
18 5/8x12 1/8, hachures, geological remarks. Scale 1:200000. (Peabody.)

1841.

ALEXANDER, J. H. Map illustrative of Allegany & Washington
Counties (with geological profile).

Ann. Rept. of the Geologist of Maryland, 1840.
16 1/2x6 7/8, hachures. Scale 1:400000. (J. H. U., Peabody.)

1843.

HALL, JAS. Geological map of the Middle and Western States.

Accompanying "Geology of New York," part iv, 4to. Albany, 18i3.
Also Issued separately. (Marcou.)

MOXON, CHAS. Sketch of the Geology of the United States.

Accompanying " On the geology of the United States" in Geologist,
edited by C. Moxon. Frontispiece. London, 1843.

" A rough reproduction and reprint of Maclure." (Marcou.)