@misc{Grout_Frank_Fitch_(1880-1958)_Bulletin,
 author={Grout, Frank Fitch (1880-1958) and Soper, Edgar Kirke (1886-?)},
 copyright={Gdańsk University of Technology Library},
 howpublished={online},
 publisher={Government Printing Office.},
 language={eng},
 type={journal},
 title={Bulletin 678. Clays and Shales of Minnesota},
 keywords={geology, mineralogy, journals, United States of America},
}