if you need a map of Albania, then go to: http://www.viamichelin.comhttp://www.viamichelin.com and there you can get entire Europe at a spot. This might help you to understand the location of Korça. If you need other sources you can think of the autokephal albanian-orthodox church or the state archive in Tirana.
The grandmother of my wife is from Korça origin, maybe she might help you as well.
Have fun and success in you research. Michael from Germany