Serving remote users on the ARPANET
RFC 364, “Serving remote users on the ARPANET”, is an Unknown document published in July 1972 by M.D. Abrams. 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 364 is hosted at rfc-editor.org. Available in TXT,HTML.