320 BIBLIOGRAPHY AND CARTOGRAPHY

PARKER, E. W. Coal.

Mineral Resources U. S., 1891, Washington, 1893.
Statistics on coal production and trade, pp. 178, 180, 255-259.

———— Mineral Paints.

Idem.

The Ocher Production of Maryland for 1889, p. 595.

———— Coal.

Mineral Resources U. S., 1892, Washington, 1893.
Statistics on production and shipments, pp. 204, 267, 268, 417-421.

———— Mineral Paints.
Idem, pp. 815-820.

PEALE, A. C. Mineral Waters.

Mineral Resources U. S., 1891, Washington, 1893.
Enumerates a few springs, pp. 603-605.

———— Mineral Waters.

Mineral Resources U. S., 1892, Washington, 1893.

Enumerates a few springs, pp. 823-824.

POWELL, S. L. Notes of Minerals recently obtained from Quarries
of Jones's Falls.

Johns Hopkins Univ. Cir. No. 103, vol. xii, 1893, pp. 49-50.
Describes calcite, ankerite, muscovite, orthoclase, beaumontite In gneiss; green
feldspar, albite-ollgoclase, garnets, helminth and epidote in pegmatite.

SCHUMANN, C. H. The Manufacture of Bricks.

Cassier's Magazine, vol. iv, 1893, pp. 403-17.

Incidental reference to products of Baltimore and Mt. Savage.

SPENCER, S. B. Natural and Artificial Cements.

Mineral Resources U. S., 1891, Washington, 1893.
Statistics and analysis of limestones from Cumberland, pp. 531-2.

STEVENSON, J. J. Origin of Pennsylvania Anthracite.
Bull. Geol. Soc. Amer., vol. v, 1893, pp. 39-70, pl. ii.

Relation of Anthracite to Maryland and Virginia coal areas, p. 43 General discus-
sion of the various hypotheses as to the origin of anthracite.

SWANK, JAMES M. The American Iron Trade in 1892.
Mineral Resources U. S., 1892, Washington, 1893.
Statistics on production and state of trade, pp. 12-22.

———— Twenty years of Progress in the Manufacture of Iron and
Steel in the United States.

Mineral Resources U. S., 1891, Washington, 1893.
Gives statistics on production, pp. 53, 54, 61.