It looks like Puppy is right, again.
Here's more copies of the book:
http://dogbert.abebooks.com/servlet/BookDetailsPL?bi=57948578
http://dogbert.abebooks.com/servlet/BookDetailsPL?bi=207864542
http://dogbert.abebooks.com/servlet/BookDetailsPL?bi=98319230
Here's the search page:
http://dogbert.abebooks.com/abe/BookSearch