http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
cas. 1: exercises L-1 through L-39. - cas. 2: exercises L-40 through L-84. - cas. 3: exercises L-85 through L-108. - cas. 4: TOEFL practice tests I and II