I checked, just for the heck of it, and yeah, they're the GM scans that've been around forever.
Assuming we're all talking about the same place, I mean. Not that there are too many options.
I won't post the link without permission either (though I do like Jon's work, especially the grading quizzes, and have to respect how hard he tried to work to keep supplying DC books at least somewhat legally), but since he has limited himself to public domain scans (well, using the same guidelines as we do here, including the weird "Fawcett doesn't count" bit), there's no legal problem with linking.
Even if the GM guy comes a-knockin', all he can do is complain that someone else is providing things that are in the public domain. Even the most liberal reading of the DMCA doesn't help him there.