I haven't tried using these maps, but I did find a website offering
historical maps of Hungarian Counties below. Unfortunately they seem to be
out of Szabolcs-Szatmar-Berg. They also don't indicate the year the map is
from. Maybe someout there is familiar with this map series and can tell if
they are of sufficient detail for the correct period.

http://www.dholmes.com/rm-book.html

Hungarian County Maps ($12.00)

This is a new series of Hungarian county maps at a scale of 1:200,000. Not
as detailed as the maps above, but they are still supurb references and, of
course, they show every village. In several ways, they are far better than
the old Cartographia maps above because they have many of the village
coats-of-arms in beautiful color, they contain a short county history in
several languages (including English), and they even give population totals
of every village and city within the county. If you already have one of the
county maps like the above >from Cartographia, you won't be disappointed in
adding one of this new series to your collection. (Price includes shipping)

Bacs-Kiskun (2 in stock)
Baranya - OUT
Bekes (2 in stock)
Borsod-Abauj-Zemplen - OUT (has Szabolcs-Szatmar-Bereg on reverse - $18)
Csongrad - (3 in stock)
Fejer (1 in stock)
Gyor-Moson-Sopron - (2 in stock)
Hajdu-Bihar (2 in stock)
Heves (2 in stock)
Jasz-Nagykun-Szolnok (3 in stock)
Komarom-Esztergom (1 in stock)
Nograd - OUT
Pest (3 in stock)
Somogy (2 in stock)
Szabolcs-Szatmar-Bereg - OUT (has Borsod-Abauj-Zemplen on reverse - $18)
Tolna (1 in stock)
Vas - OUT
Veszprem - OUT
Zala (2 in stock)