@misc{Marshall_Robert_Bradford_(1867-1949)_Bulletin, author={Marshall, Robert Bradford (1867-1949)}, howpublished={online}, publisher={Government Printing Office.}, language={eng}, type={czasopismo, dodatek}, title={Bulletin 633. Spirit leveling in Maine 1899-1915}, keywords={geologia, mineralogia, czasopisma, Stany Zjednoczone}, }