>>> Is this not documented or did I just overlook it
>>
>> It is documented.
>>
>>> From grops(1): [...]
>>
>> and from groff_font(5): [...]
And from groff_tmac(5):
Special Packages
[...]
papersize
This macro file is already loaded at start-up by troff
so it isn't necessary to call it explicitly. It
provides an interface to set the paper size on the
command line with the option -dpaper=size. Possible
values for size are the same as the predefined papersize
values in the DESC file (only lowercase; see
groff_font(5) for more) except a7-d7. An appended l
(ell) character denotes landscape orientation.
Examples: a4, c3l, letterl.
Most output drivers need additional command line
switches -p and -l to override the default paper length
and orientation as set in the driver specific DESC file.
For example, use the following for PS output on A4 paper
in landscape orientation:
sh# groff -Tps -dpaper=a4l -P-pa4 -P-l -ms foo.ms > foo.ps
Werner