Wagrowice
I can't find any reference to this place at all, I'm wondering if it is Wągrowiec instead:-
en.wikipedia.org/wiki/W%C4%85growiec
River Vistula
That's just the name of Poland's longest river. In Polish it is called the Wisła.
Pawlowice (is that near a place called Leszno?)
There is one in Leszno County:-
en.wikipedia.org/wiki/Paw%C5%82owice,_Leszno_County
but there are also many other places in Poland with the same name:-
en.wikipedia.org/wiki/Paw%C5%82owice