http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
papers presented at the Symposium on Columbium (Niobium)
Symposium on Columbium (Niobium) (1958 : Washington, D.C.)
viii, 120 pages : illustrations, diagrams, tables. ; 29 cm.
Edited by B.W. Gonser and E.M. Sherwood.