Where can I find existing System Usability Scale (SUS) results to compare against?

I'm looking for a resource of existing System Usability Scale (SUS) study results to compare against.

I've read in a few papers/webpages that plenty of such data is available, unfortunately I can't seem to find any immediately.

I could probably find separate papers with separate results, but I got the impression they were talking about databases.

Are there any resources which compile SUS study results and optionally allow you to access it by category?