I've never been able to find an electronic copy of his 1949 report "The Transmission of Information", it's missing from DSpace@MIT, so here's a scan:

https://archive.org/details/fano-tr65.7z

This was an original conception of information theory, somewhat beat to the press by Shannon, though the two had talked about it (and indeed Shannon cites this in "A Mathematical Theory of Communication").

I have a copy of TR 149, Transmission of Information II, as well, but no scanner anymore.