MARYLAND GEOLOGICAL SURVEY 235
1776.

POWNALL, T. Topographical description of such parts of North
America as are contained in the (annexed) map of the British middle
colonies, etc., in North America. London, 1776.

1778.

BURNABY, ANDREW. Travels through the Middle Settlements in
North America in the years 1759 and 1760; with observations upon
the State of the Colonies.

(Repub.) Pinkerton's Voyages and Travels, vol. xiii, London, 1812, pp.
701-752.

This is from the 3rd edition, London, 1798. Pages 725-727 deal particularly with his
journey in Maryland.

HUTCHINS, THOS. A Topographic Description of Virginia, Penn-
sylvania, Maryland and North Carolina. London, Printed for the
author in MDCCLXXYIII.

Less mention of Maryland than the title would Indicate, chiefly deals with country
west of Pittsburgh.

1784.

SWEDENBORG, EMANUAL. Regnum Subtcrraneum sive Minerale de
Ferro. [etc.] Dresdae et Lipsiae. MDCCCLXXXIV.

Paragraphus XIII, entitled " Modus venam ferri coquendi, ierrumque crudam reco-
quendi Marylandiae & Pensilvaniae in India occidental!," contains references to the
Principle furnaces, pp. 162-163. This Tolume is the second of three which deal with
the official survey of Sweden.

1787.

SCHOEPF, JOHANN DAVID. Beitrage zur mineralogischen Kenntniss
des ostlichen Theils von Nord-Amerika und seinen Gebirge. 194 pp.
Erlangen, 1787.

1788.

JEFFERSON, THOMAS. Notes on the State of Virginia. Phila.
1788. sm. 8vo. 244 pp.

The author gives many interesting facts and speculations concerning the geology
about Harper's Ferry. Fully ten editions of this book were published in different
places between 1782 and 1832, each with different number of pages.