In 1992, the book _Semantic Networks in Artificial Intelligence_
contained about 25 chapters on graph notations for logic.
It was also published as a collection of related articles in
the journal _Computers and Mathematics with Applications_.

After 20 years (2002), the articles became available for free
download, but I just discovered them today.  Three of them
discuss existential graphs:

Don D. Roberts, The existential graphs

Robert W. Burch, Valental aspects of Peircean algebraic logic

John F. Sowa, Conceptual graphs as a universal knowledge representation

But the following article from 2014 is much better than the above:
From existential graphs to conceptual graphs

To view or download any of the other articles, see

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