This is the 6130th most frequent Polish word.
archiwalne
"Archiwalne" means "archival" or "related to archives."
Here, 'archiwalne' is used as an adjective to describe photographs that are historical and stored as records.
Znalazłem archiwalne fotografie z wakacji sprzed lat.
I found archival photographs from holidays years ago.
In this sentence, 'archiwalne' modifies 'dokumenty', indicating that these documents are old and preserved for historical purposes.
Archiwalne dokumenty zostały przeniesione do nowego magazynu.
Archival documents have been moved to a new storage facility.
'Archiwalne' in this context refers to books distinguished by their age and importance for recordkeeping.