http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
τ. 1 Cretaceous planktonic and Paleozoic Foraminifera -- τ. 2 Tertiary planktonic Foraminifera. -- τ. 3 Cataloque of index smaller Foraminifera.