@misc{Harder_Edmund_Cecil_(1882-?)_Bulletin,
 author={Harder, Edmund Cecil (1882-?) and Johnston, A. W.},
 copyright={Gdańsk University of Technology Library},
 howpublished={online},
 publisher={Government Printing Office.},
 language={eng},
 type={journal},
 title={Bulletin 660-A. Notes on the geology and iron ores of the Cuyuna district, Minnesota},
 keywords={geology, mineralogy, journals, United States of America},
}