At times, discussion was about future work rather than the existing specification.
Boldface indicates current RFCs which describe the current protocol specification.
Note the RFCs are ordered by date, not number. This was not so much a specification as a proposal that some form of File Transfer Protocol be developed. As follow-up comments show, while there was some discussion about how the protocol would work, and it was viewed more as an example than an actual specification. This represents the first actual attempt to specify a fully working File Transfer Protocol. The separation into two protocols can be viewed as an early recognition that some form of generalized, reliable data transfer was needed.