For a seat map for the DC-10:,
http://www.nwa.com/travel/trave/seat...0/index2.shtml
(Yes 22 is an exit row).
I have had discussion in the past with KL reservations agents in the UK on NW-operated transatlantic flights. It appears that they can access the full seat maps but it is a somewhat convoluted process and not all agents seem to know how to do it.