PLATO Empire source?

[Mouse]

Back in the late '70s, I played a game called -0empire- on a PLATO
system hosted, IIRC, at UIUC.  Reading
http://www.daleske.com/plato/empire.php, the best match to my memory is
Empire IV (IIRC, the 0 prefix indicates that the lesson was installed
system-wide, rather than being a relatively meaningless part of the
name), and http://www.daleske.com/plato/empire-control.php says, inter
alia, "You are welcome to look at the source code under Open Source
Commons.".

However, it appears my search-fu is too weak to _find_ that source
code.  So my question for the collective wisdom here is, anyone know
where I might be able to find it?

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