Author: ACH (Alexander Dallas)

Description

]3ACH (Alexander Dallas). Reoords and results of a magnetic survey of Pennsylvania and parts of adjacent states in 1840 and 1841, with some additional records and results of 1834—35, 1843 and 1862, and a map. pp. 81. See WASHINGTON (COLUNBIA). Smithsonian Institution. Smithsonian Contributions to Knowledge. Vol. XIII. article 8. no 166. Washington, 1863.

Card ID: 382