In all fairness, I don't how many others (if any) were made without permission. They do seem to have notes of thanks from some authors.
I have "cooled off" a bit -- thanks for the words of advice. My current plan is to send them an email requesting an explanation before further action. I don't especially want to give them my regular email address, so I've set up a new account (which includes the word "copyright") at gmail for this purpose.
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