400 BIBLIOGRAPHY AND CARTOGRAPHY

DARTON, N. H. Map of Portions of Maryland, Virginia and Dis-
trict of Columbia showing distribution of the Potomac Formation in
part overlain by Columbia and Lafayette formations from data fur-
nished by K H. Darton 1896.

Bull. U. S. Geol. Surv. No. 145, 1896, facing p. 14.

7 3/8x19, four colors, geological outline, drainage. Scale 1/500000 or 8 miles to an inch. (J. H. U.)

————Nomini Folio.

Geologic Atlas of the United States, folio No. 23. Washington, 1896.
13 7/8x17 1/2, contour 20 ft., four colors. Scale 1/125000.

The Coastal Plain region of Maryland and Delaware, show-

ing relations of underground waters, by N. H. Darton.
Bull. U. S. Geol. Survey No. 138, 1896, pl. v.
8x9, colored, symbols. Scale 15 miles to an inch.

———— Map of Baltimore region, illustrating features of under-
ground waters, by N. H. Darton.

Bull. U. S. Geol. Survey No. 138, 1896, pl. vii.
8x10, colored, symbols. Scale 1 mile to an inch.

DARTON, N. H. & TAFF, Jos. Piedmont Folio.

Geologic Atlas of the United States, folio No. 28. Washington, 1890.

13 7/8x17 1/2 1/2, contour 100 ft, colors. Scale 1/125000.

MARYLAND STATE WEATHER SERVICE. Map of Maryland and
Delaware showing the Precipitation and lines of mean temperature for
1896.

Monthly Report, 1896-7, vol. vi and vol. vii.
Maps given for each mouth, Jan.-April.

U. S. COAST AND GEODETIC SURVEY. Potomac River. From Indian
Head to Georgetown. No. 391.

(First edition, 1862) 23x39 (class F). Scale 1/40000 or 1.58 inches to a mile.

U. S. GEOLOGICAL SURVEY. Topographical Sheets. Annapolis.

13 5/8x17 1/2, 20 ft. contour. Scale 1/G2500.

Topographical Sheets. Baltimore.

13 5/8x17 1/2, 20 ft. contour. Scale 1/62500.

———— Topographical Sheets. Drum Point.

13 5/8x17 1/2, 20 ft. contour. Scale 1/62500.

———— Topographical Sheets. Ellicott.

13 5/8x17 1/2, 20 ft. contour. Scale 1/62500.

———— Topographical Sheets. Frederick.

13 5/8x17 1/2, 20 ft. contour. Scale 1/62500.