Symbols.com
"symbols.com - Encyclopedia of Western Signs and Ideograms: ""The semiotics of Symbols---Western Non-pictorial Ideograms"". (online version of Carl G Liungman's book ""Thought Signs"" [1975])"
"symbols.com - Encyclopedia of Western Signs and Ideograms: ""The semiotics of Symbols---Western Non-pictorial Ideograms"". (online version of Carl G Liungman's book ""Thought Signs"" [1975])"