@misc{Wells_Roger_Clark_(1877-1944)_Bulletin,
 author={Wells, Roger Clark (1877-1944)},
 howpublished={online},
 publisher={Government Printing Office.},
 language={eng},
 title={Bulletin 717. Sodium sulphate: its sources and uses},
 type={czasopismo},
 keywords={geologia, mineralogia, czasopisma},
}