I had never heard of that document, but it looks cool!

I see that jt is here: http://orgmode.org/cgit.cgi/org-mode.git/tree/doc/library-of-babel.org

(It got moved in 2013: http://orgmode.org/cgit.cgi/org-mode.git/commit/?id=321f806fafb596b53da7c944267f53f34d05af3e)

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Kaushal Modi