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I would write up a simple cease and desist letter and send it to the registrar, web host, page owner, Google, and anyone else you can identify. You might even be able to write a script that does some lookups for you. May not work for foreign domains, hosts, etc. But, maybe. YMMV

> script that does some lookups for you

Might want to check out https://plagiashield.com/

I use it occasionally but don't have an active subscription. But it's decent at finding stolen content (except for false positives on privacy policy & TOS)

Send DMCA complaints to google

Unfortunately it sounds to like a lawsuit may be your best bet.

Unless they are hosted by people in countries unfriendly with the US, in which case good luck.

With what license do you publish them?