00972cam a22002531 4500 s 13000062 DLC 20260227111910.0 780221s1863 dcua f000 0 eng c s 13000062 (OCoLC)3655364 Library, Smithsonian Institution NGenoU NGenoU DLC premarc n-us-pa w3w6 Q11 .S68 vol. 13 Bache, A. D. (Alexander Dallas), 1806-1867. Records 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. By A. D. Bache. [Washington, Smithsonian Institution, 1863] vi, 82 p. chart. 33 cm. Smithsonian contributions to knowledge. [vol. XIII, art. 8] Smithsonian Institution publication 166. Geomagnetism Pennsylvania. 52630 52630