@misc{Hewett_Donnell_Foster_(1881-?)_Bulletin,
 author={Hewett, Donnell Foster (1881-?)},
 copyright={Gdańsk University of Technology Library},
 howpublished={online},
 publisher={Government Printing Office.},
 language={eng},
 type={journal},
 title={Bulletin 640-C. Some manganese mines in Virginia and Maryland},
 keywords={United States of America, geology, mineralogy, journals},
}