MARYLAND GEOLOGICAL SURVEY 387

4th Dist. (Anne Arundel). Scale 1 1/2 inches to the mile.
5th Dist. (Anne Arundel). Scale 2 inches to the mile.
Map of state, etc. (Peabody.)

MARTENET, SIMON. Map of Harford County.

Scale 1 mile to 1 1/2 inches. (Belair.)

RATZEL (FRIEDER). Geologische Karte der Vereinigten Staaten.
Die Vereinigten Staaten von Nord Amerika, vol. i, p. 28. unchen, 1878.
Perhaps reduced from 3rd issue of Hitchcock & Blake (7). (Marcou.)

TWINNING, WM. I. (?). Plat of award with certificates signed by
Boundary Commissioners and Governors 9th Sept. 1878.

Platted on coast chart No. 33, Chesapeake Bay sheet No. 3, of U. S. Coast
and Geodetic Survey. Scale 1/80000. (Peabody.)

1879.

HOPKINS, G. M. Atlas of fifteen miles around Washington includ-
ing the County of Montgomery, Md. 4°. Phila. 1879.

Same as Hopkins " Prince George," but with different title.

MACFARLANE, J. Geological sketch of the United States.
An American geological railway guide, p. 216. New York, 1879.
Octavo, black etching and numbers. (J. H. U.)

1880.

ANON. Topographical Map of the District of Columbia showing
the Projected Harbor Improvements (etc), corrected to 1880.

20x20, contour, symbols. Scale 3000 ft. to an inch. (J. H. U. Hist.)

U. S. COAST AND GEODETIC SURVEY. Patuxent River (lower part).
No. 386. Last edition (first edition, 1859).

19x22 (class F). Scale 1/60000, or 1.06 inches to a mile.

About 1880.
Frederick County, Maryland (manuscript.)

19x20. Scale 2 miles to an inch. Drainage in blue, roads in red, railroad in black.
(Looks like base of county map.) (Amer. Geog. Soc.)

(Map of Gunpowder River).

22 1/2x11 3/8, hachure. Scale 72 inches to a mile. (Peabody.)

KETTLEWELL, S. H. Plan and Profile of Proposed Diversion of
Jones Falls from Belvidere Bridge to Head of Back Creek (etc).

34x10, hachured. Scale about 875 feet to an inch. (J. H. U. Hist..)