Mathematical Illustrations an introduction to mathematical illustrations using postscript programming language.
Don Lancaster and his many notes on postscript publishing.
Dec 2022 - PostScript: A Digital Printing Press | Hacker News. Main discussion about PostScript: A Digital Printing Press from the Computer History Museum article, but the HN page has lots of links to PS stuff.
A First Guide to PostScript by Peter Weingartner. Online book.
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See also: My Hello Postscript page.