I cannot help you with obtaining official documrnts, but may be the following info, taken from JewishGen.org, can be of interest for you.
1.
http://www.shtetlinks.jewishgen.org/Brody/brody_cemetery_dat...http://www.shtetlinks.jewishgen.org/Brody/brody_cemetery_pro...Naftali (bochur Nathan), son of Z—Ha-Kohen BYK. Died 1882.
2.
Galicia 1891 Business Directory
http://www.jewishgen.org/databases/galicia1891.htmBYK – two lawyers in LWOW, and one business agent in Brody.