http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
W. H. Severns, H. E. Degler, J. C. Miles ; versión española por José Batlle Gayán.
Steam, air, and gas power. Spanish (Batlle Gayán)
Severns, William H. (William Harrison), 1888-1956.