This is a bit hastily thrown together, but it should work for most systems.
To use:
Navigate to the page for a system on radioreference.com. These pages have the URL /db/sid/#### where # is a digit, and have a "Talkgroups" section with some tables.
Click the blue "Menu" button in the top-right-ish area, then click "Download as CSV"
If all goes well, you should get a save-as dialog
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