Walter J. Diethelm ( the author ) is born in Switzerland. He was devoted to typography and graphic design. Died in Zurich, 1986. As far as I can see – he’s an author of some other interesing stuff. If someone is familiar with his Bio – please, share :)

Here comes 2 great PDF books :
Top Symbols and Trademarks of the World – volume 1
( 130 pages – 520 logos – 8 MB )
Top Symbols and Trademarks of the World – volume 2
( 155 pages – 600 logos – 17.5 MB )
–
“Top Symbols And Trademarks Of The World” was published in 1973, written by [...]