One of the best examples of a semantic network was done at MIT by Scott Fahlman. His dissertation was published by MIT Press… see the small pdf below that shows some of his ideas. Sorry about the underlining! When I read, I often underline… and I found to my dismay that I did not have a clean copy of the book!
Well, it is worth reading no matter!
Be sure to click on the “full screen” button at the top right of the pdf so you can see it full screen.