@misc{Butts_Charles_(1863-1946)_Bulletin, author={Butts, Charles (1863-1946) and Moore, Elwood S. (1879-1966)}, copyright={Biblioteka Politechniki GdaƄskiej}, howpublished={online}, publisher={Government Printing Office.}, language={eng}, title={Bulletin 855. Geology and mineral resources of the Bellefonte Quadrangle, Pennsylvania}, type={czasopismo}, keywords={geologia, mineralogia, czasopisma, Pensylwania (Stany Zjednoczone ; stan), Stany Zjednoczone}, }