[Proj] Polish System 65 maps

[Irwin Scollar]

The boundaries of the zones (Strefa) in the Polish 1965 Roussilhe 
system extensively discussed on this list in 2005-2006 are highly irregular.

Given the lat/lon (Krassovsky ellipsoid) of an arbitrary point in 
Poland between 49N - 55N and 14E and 24E, how can I determine in 
which zone the point lies so that the different false eastings and 
northings in each zone as well as the parameters for the GK piece in 
zone 5 can be used to get the Roussilhe E/N values using either 
sterea or Otto van Vlijman's version?

This is a classic "point in polygon" problem, but where can one get 
the 5 polygons (ArcGis Shape Files for the zones perhaps) with 
accuracy sufficient to use with the 1:10000 maps with minimum error 
at zone boundaries?  Alternatively, where can I find a file of 
coordinates in lat/lon or E/N for the corners of the whole collection 
of 1:10000 maps?

My knowledge of Polish unfortunately is nil, but a reference would be 
appreciated none the less.

iscollar