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This is something you do have to watch for: just because the composition is public domain, doesn't mean the exact score you found is. Another really good source for public domain sheet music is Mutopia project. Not all of it is public domain, but a lot of it is, and with Mutopia project all the scores are in a consistent format and include midi files, which is a huge plus. The site hasn't been updated for years but it has a pretty big collection.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.