Glad to make your acquaintance. My name is Brad Bunk. Antoni Bak was my grandfather. My father was his son George, Born 1928. Our paternal grandmother was Sofia, and her maiden name was Pustelniak.
They were both from Rogoznica. As you probably already know, Galicia was part of the Austria-Hungarian empire until the end of WWI where is ceded to the newly created Poland state.
Rogoznica is in South Eastern Poland, a few miles north of the city of Rzezeow. Here is a link to the Communities website translated into english. http://tinyurl.com/8xkytyv
If you would like some more info, or chat about ancestry, you can email me at firstname.lastname@example.org