@misc{Lesher_Carl_Eugene_(1885-?)_Bulletin,
 author={Lesher, Carl Eugene (1885-?)},
 copyright={Gdańsk University of Technology Library},
 howpublished={online},
 publisher={Government Printing Office.},
 language={eng},
 type={journal},
 title={Bulletin 621-A. Field apparatus for determining Ash in Coal},
 keywords={geology, mineralogy, journals},
}