Does anyone know where to find a key to abbreviations for the German World War I casualty lists? I'm specifically looking for what the rank at the beginning of the example below is. The individual was in "Reserve-Infanterie-Regiment Nr. 212". I've transcribed his entry as follows (image snippet below in case I've goofed on reading the Fraktur):

Oblt. a. D. u. Adj. Walter Otto Henning Trentepohl (Stab des III. Batls.) — Gut Rosenthal b. Pelplin — leicht verwundet (siehe B. Z. Nr. 130)

I recognize "Oblt." as "Oberleutnant", but don't know what the "a. D. u. Adj." part means.

Also, I take "Gut Rosenthal b. Pelplin" to be a place of birth. If that's right, can anyone confirm if it's present-day Rożental, Poland (Google map link: http://maps.google.com/maps?z=9&q=53.9167,18.7000+%28Ro%...)