http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
GIBSON, W.Herbert: -- Concrete Design and construction.2.ed. -- Chicago:Amer.Techn.Soc.1947. 500 S. mit -- 251 Fig. 8° -- 1969:3774/gb. -- Un.°