Hello,
About the "Introduction to Maxima" by Richard Rand
(http://maxima.sourceforge.net/docs/intromax/intromax.html),
its earliest appearance in Maxima (July 2000) appears to be Maxima 5.5 beta
(http://sourceforge.net/project/showfiles.php?group_id=4933)
It apparently was committed to cvs by Bill Schelter shortly thereafter
(http://cvs.sf.net/viewcvs.py/maxima/maxima/doc/intromax/intromax.ltx?view=log)
In that revision, it appears to have been prepared by one Nelson L. Dias.
(I am pretty sure it was committed to a cvs repository at U Texas which
was later imported into Sourceforge.)
I did some clean up and updating in August 2005.
There isn't a license notice in the document itself.
Also, I haven't found any correspondence between Rand, Dias, and Schelter.
Richard Rand appears to be at Cornell U (http://tam.cornell.edu/Rand.html).
There is an affiliation and email address for Nelson Dias in the document.
If Richard Rand ever granted permission to include the document
in Maxima, I can't find it now.
If we don't uncover evidence of such within a day or so,
I will try to email him about it.
best,
Robert Dodier