@misc{Butler_Bert_Sylvenus_(1877-1960)_Bulletin,
 author={Butler, Bert Sylvenus (1877-1960) and Heikes, Victor Conrad(1867-1948)},
 copyright={Gdańsk University of Technology Library},
 howpublished={online},
 publisher={Government Printing Office.},
 language={eng},
 title={Bulletin 640-A. Notes on the Promontory district, Utah},
 type={journal},
 keywords={geology, mineralogy, United States of America, journals},
}