Documentation Conventions
RFC 30, “Documentation Conventions”, is an Unknown document published in February 1970 by S.D. Crocker. It updates RFC 10, RFC 16, RFC 24, RFC 27. 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 30 is hosted at rfc-editor.org. Available in TXT,HTML.