@misc{ 0-1147373787, title = {National geochronological and natural radioelement data bases}, series = {U.S. Geological Servey digital data series}, author = {Zartman, Robert E. and Bush, Charles A. and Abston, Carl}, address = {s.l.}, year = {1995}, language = {Undetermined}, note = {A. National geochronological data base. - B. Natural radioelement data base}, url = {https://katalog.ub.tu-freiberg.de/Record/0-1147373787} }