It's a superb little city and well worth a visit. Go there, you won't regret the trip at all.
[Edit: posted with the wrong username there, sorry all.]
sztetl.org.pl/en/article/proszowice/3,local-history/
sztetl.org.pl/en/article/proszowice/5,history/
I didn't find much in english, hope this helped.
pl.wikipedia.org/wiki/Proszowice
proszowice.pl/asp/pl_start.asp?typ=13&menu=1&strona=1