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/usr/share/doc/debiandoc-sgml-doc/README.Debian is in debiandoc-sgml-doc 1.1.22.

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The actual contents of the file can be viewed below.

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debiandoc-sgml-doc for Debian
=============================

The source files for the documentation in this package can be obtained
as follows:

1.  Include a "deb-src" line in the "/etc/sources.list", e.g.

      deb-src http://ftp.us.debian.org/debian/ unstable main

    For more information on this see the manual page sources.list(5).

2.  Download the source withthe following command:

      apt-get source debiandoc-sgml-doc

--
Ardo van Rangelrooij <ardo@debian.org>