Bache, A. D.  1806-1867. <br/><br/>
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. .
<br/><br/><label>LCCN: </label>s  13000062  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geomagnetism--Pennsylvania.
<br/><br/><label>LC Class. No.: </label>Q11  / .S68 vol. 13