Comments on the Meyer Proposal
RFC 50, “Comments on the Meyer Proposal”, is an Unknown document published in April 1970 by E. Harslen, J. Heafner. 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 50 is hosted at rfc-editor.org. Available in TXT,HTML.