Former Yugoslavia Help, Please?

Where were these canceled? Three partial strikes that I have not been able to pinpoint. Can anyone help, please?
A.In Roman alphabet at top of the cancel, I can read "...ANSKICRN..."
Could have been BOSANSKI CRN...?
B."... POžAREV" in Roman at bottom of the cancel. Found Požarevac, but not Požarev. Could it have lost the ...ac"?
C. Difficult to see, but in Cyrillic at bottom of the cancel:
"...O?A DUBRANA" Don't find that name, either.
HELP!?

I can't be sure but:
The closest I came to DUBRANA is DUBRANI in what is now Bosnia Herzegovina. DUBRANA however, could be the name in Serbian.
The letters before DUBRANA read something like ONJA (the letter before the A is pronounced NJ.)If the word is DONJA, then it would be 'DONJA DUBRANA' or 'Lower Dubrana' - and I think this refers to a region rather than a specific town.

B. Maybe Petrovac Pozarev


C. Maybe Donja Dubrava,now in Croatia

Thank you both!