Publisher: [Usenix]

Publication date: 1995, 1996, 1997, 1998

Price: varies from year to year

WWW book information: http://www.usenix.org/

Usenix prints the proceedings from each year's Tcl/Tk workshop.
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Note that individual papers from the proceedings are available, for free, 
from the web site above.
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[Category Book]