I don't use the Classic Dvorak layout, but it exists in console and not
in X. This is the mail from Russel telling about their necessity:

--------------Russell L. Harris <rlharris@oplink.net>------------------
The original keyboard layout (or keymap) which August Dvorak devised in 1936
differs significantly from the "modified" Dvorak layout which was adopted by
ANSI in 1983.   The differences are confined to the numeric row and the first
alphabetic row.

The original or "classic" Dvorak layout has the numeric row in the following
sequence:

    [{  7&  5%  3#  1!  9(  0)  2@  4$  6^  8*  ]}

Also, on the first alphabetic row of the original Dvorak layout, the

   /?

key is on the left, while the

   '"

key on in the right.

GNU/Linux distributions including Debian currently provide for console users
both the ANSI Dvorak layout

   dvorak.kmap.gz

and the the original or "classic" Dvorak layout

   dvorak-classic.kmap.gz

But at the current time, the Xorg package provides only the ANSI Dvorak layout.

I have not yet been successful in patching the Xorg keyboard files so as to
implement the "classic" Dvorak layout.
-----------------------------------------------------------------------

If the layout is needed in console, maybe ppl needs it in X, too.
I change the ANSI dvorak to do that. The layout answers the bug
264647 in debian bugzilla, too.

The patch is in http://piterpunk.info02.com.br/extra/classic.patch and
can be applied in xkeyboard-config 0.8.