http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
τ.1:The letters I.--τ.2: the letters II.--τ.3: the letters III.--τ.4: the letters.
Loeb classical library ; ; 190 , 215 , 243, 270