A User TELNET Description of an Initial Implementation
RFC 206, “A User TELNET Description of an Initial Implementation”, is an Unknown document published in August 1971 by J. White. 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 206 is hosted at rfc-editor.org. Available in TXT,PDF,HTML.