The creator of this much-praised map, Reinhold Zwerger, died in early 2009. It is now distributed by his daughter, Lisbeth Zwerger. (Ms Zwerger, presumably not by coincidence, is a noted illustrator.) According to a May 2010 correspondent, she may be reached by mail, at
Lisbeth Zwerger
Radingerstrasse 17/22
A-1020 Wien
AUSTRIA
Her telephone number is 726-6980 (or 011 43 726-6980, as dialed from America). She speaks English and will send you a map on request. Once you have received it, you send her €25 (that’s euro!) in cash.
In 2007, Mr. Zwerger made, by hand, several updates to his map. These may or may not be integrated into the map as it is currently distributed. In any event, the changed areas can be viewed online.