I'd say there's not enough information to be sure, not just by the contents. I'll translate every part that includes anything with association to Data surname.
Chapter: KAWALEROWIE VIRTUTI MILITARI 329
(Cavaliers of Virtuti Militari Order)
Subchapter: Józef Data 329
Chapter: WIERNI SWEJ MA£EJ OJCZY-NIE 349
( Loyal to their small fatherland )
Subchapter: Stanisław Data 351
Chapter: Illustrations listing ( probably just a list of people on different illustrations from the book )
171. Józef Data, legionista 329 ( Józef Data, legionnaire )
182. Stanisław Data 351
That's all there is, it might be worth getting the book, or at least calling the city council and getting some information that you could correlate with what you've come up with.