The historie of tvvelve Cæsars emperours of Rome:
Thou canst be of Service
The original transcription came from the Text Creation Partnership, who explicitly placed it (and all their other texts) in the public domain.
It was transcribed by hand, using slaves in heavy chains deep in the salt-mines of Michigan (or something). But the transcription was from microfilm copies that were hard to read, so parts are missing.
You can help by transcribing a single paragraph (or just one gap if you like), using the page images on archive.org (which seem to be of the same copy that was actually used, but photographed much more clearly).
Plain text is fine (Unicode, UTF-8), and you can type it here and send it, if you like, or email it to slave at fromoldbooks dot org.
