@misc{Marshall_Robert_Bradford_(1867-1949)_Bulletin,
 author={Marshall, Robert Bradford (1867-1949)},
 howpublished={online},
 publisher={Government Printing Office.},
 language={eng},
 type={czasopismo},
 title={Bulletin 637. Spirit leveling in Texas 1896 to 1915, inclusive},
 keywords={geologia, mineralogia, czasopisma, Stany Zjednoczone},
}