MARYLAND GEOLOGICAL SURVEY 391

———— Martenet's map of Maryland and District of Columbia,
1885.

72x46. Districts tinted, ridges hachured. Scale 3 1/2 miles to an inch, or 1/221760.
(Peabody.)

1886.

BENTON, EDWARD R. Map of Eastern Maryland, showing location
of iron orebands sampled.

10th Census, vol. xv, Mineral Industries of the United States. Washing-
ton, 1886.

6x6, outline. Scale approx. 10 miles to an inch.

PUMPELLY, RAPHAEL. Geological Distribution of the Iron Ores of
the United States.

10th Census, vol. xv, Mineral Industries. Washington, 1886.
11x18, colored. Scale 83 1/2 miles to an inch.

WILLIAMS, G. H. Geological map of the Baltimore Gabbro-area,
colored upon a portion of the. Johns Hopkins University Excursion
map.

Bull. U. S. Geol. Survey No. 28. Washington, 1886.

11 1/2x13 5/16, five colors. Scale 1/62500. Actual outcrops and generalized distri-
bution represented. (J. H. U.)

1887.

HITCHCOCK, C. H. Geological map of the United States.
Trans. Amer. Inst. Min. Eng., vol. i, pp. 465.

WEBSTER, ALBERT L. Baltimore and its neighborhood. An Ex-
cursion Map compiled for the Johns Hopkins University, etc. Edited
by Albert L. Webster. Drawn by Louis Neil. Second edition.
Johns Hopkins University. 1887.

25x25, outline. Scale 1 mile to an inch.

WINSOR, JUSTIN (?). Map of Maryland (showing original charter
Boundary and the present Boundary).

Winsor's Narrative and Critical History of America, vol. v. Boston, 1887.
p. 272.

5x7 1/2. Scale 33 miles to inch.

1888.

ANON. Sketch showing Progress of Triangulation in the Appalach-
ian Region to June 30, 1886.

Seventh Ann. Rept. U. S. Geol. Survey, 1888, pocket.
23 1/2x19, black, outline. Scale 30 miles to an inch. (J. H. U.)