@misc{Emmons_William_Harvey_(1876-1948)_Bulletin,
 author={Emmons, William Harvey (1876-1948)},
 howpublished={online},
 publisher={Government Printing Office.},
 language={eng},
 type={journal},
 title={Bulletin 625. The enrichment of ore deposits},
 keywords={geology, mineralogy, journals},
}