Gopher related RFC’s
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  HTML RFC 1436 - The Internet Gopher Protocol
  HTML RFC 1580 - Guide to Network Resource Tools
  HTML RFC 1738 - Uniform Resource Locators (URL) (Obsoleted by RFC 4266)
  HTML RFC 1739 - A Primer On Internet and TCP/IP Tools (Obsoleted by RFC 2151)
  HTML RFC 2151 - A Primer On Internet and TCP/IP Tools and Utilities
  HTML RFC 4266 - The gopher URI Scheme