http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Microfiche. [S.l. : s.n.] microfiches : negative. No. 175 (Aug. 1, 1968) filmed before issue no. 174 (June 1964).
Publication suspended after no. 174 (June 1964) and resumed with no. 175 (Aug. 1, 1968).