I am trying to find more information on my great-great grandfather who died in World War I while serving in the Austro-Hungarian Military. I used the Kramerius website and did a search on his last name, Langenek, and found him (Friedrich) listed on the Aphabetisches Verzeichnis der in den Verlustlisten only. This at least confirms that yes he died in World War I. I'm not sure what the 430 after his name means though or how to find out more about him.
Any ideas? I can tell you that his wife and child, my great-grandfather, lived in Vukovar at that time (it is now part of Croatia - Yugoslavia after WWI)and that he was born around 1886. I don't know where to go next.
Thanks for any help or advice!