This is the 1984th most frequent Polish word.
dotyczącą
Relating to.
The word 'dotyczącą' serves as a participle and means 'regarding' or 'related to', linking 'documentation' to 'this project'.
Czy masz dokumentację dotyczącą tego projektu?
Do you have the documentation regarding this project?
Here, 'dotyczącą' indicates that the decision is related to the policy changes.
Podjęto decyzję dotyczącą zmian w polityce.
A decision regarding policy changes was made.
In this sentence, 'dotyczącą' is used to describe the content of the book, connecting 'book' to 'history of Poland'.