Looking for any help...

My grandma's parents were both from Augustow, Podlaskie, Poland. Her father was named KAZIMIERZ DOBROWOLSKI and he was born on January 4, 1892 in Augustow. His father's name was Andrzej and he had a brother Antoni. Kazimierz and Antoni were both bakers and came to the U.S. My grandmother told me there was another brother Jozef.

Her mother was named LEOKADJA NOWAKOWSKA and she was born on December 9, 1895 in Augustow. Her father's name was Kazimierz Nowakowski.

Kazimierz and Leokadja came to the U.S. and married in Pennsylvania. I would like to trace their families further but don't know where to start, any help??