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Copyright notice for Raj Wall's copy:

Copyright 1988 The Ohio State University Laboratory for AI Research.
Permission is hereby given to use this software, and to make and use
copies for it for non-commercial uses, and for use on projects
sponsored by the Federal Government.  No permission is given to sell
this software above copying cost.  Nor is permission given to sell
derivative works, either applications build using this software or
software embodying the same technology, without first coming to
specific agreement covering that with The Ohio State University and
the Laboratory for AI Research.  Use for research and prototyping of
knowledge-based systems is strongly encouraged.
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