Documents by E. Levinson
1995, RFC1872: The MIME Multipart/Related Content-type
1995, RFC1873: Message/External-Body Content-ID Access Type
1995, RFC1874: SGML Media Types
1996, RFC1895: The Application/CALS-1840 Content-type
1997, RFC2111: Content-ID and Message-ID Uniform Resource Locators
1997, RFC2112: The MIME Multipart/Related Content-type
1998, RFC2387: The MIME Multipart/Related Content-type
1998, RFC2392: Content-ID and Message-ID Uniform Resource Locators