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RichardThis isn't my site (so I hope it's okay that I share this), but one very handy resource for this kind of thing is Dan Austin's virtual checklist. Have a look at http://www.vintagecardtraders.org/virtual/ and you can see galleries of a number of sets, including T207.
A few months ago I also came across a site dedicated to cataloguing St. Louis baseball cards, but I'm not a St. Louis collector, so I didn't make any special note of it. If I can find it again, I'll pass it along.
Regards,
Richard.