TY - JFULL ID - 139105795 TI - Columbium (niobium) and tantalum AU - United States. AU - Geological Survey (U.S.) PY - PB - [Washington, DC] : [U.S. Dept. of the Interior, Bureau of Mines] DB - UniCat KW - Niobium KW - Tantalum UR - https://www.unicat.be/uniCat?func=search&query=sysid:139105795 AB - ER -