BBN's Comments on NWG/RFC #33
RFC 47, “BBN's Comments on NWG/RFC #33”, is an Unknown document published in April 1970 by J. Postel, S. Crocker. It updates RFC 33. The canonical text is published by the RFC Editor.
What “Unknown” means
The standards-track status of this early RFC was never formally classified.
The canonical text of RFC 47 is hosted at rfc-editor.org. Available in TXT,HTML.