Columbia subject headings:
Acid deposition--Environmental aspects--Poland--Kraków.
Architecture--Conservation and restoration--Poland--Kraków.
Cultural property--Protection--Poland--Kraków.
Historic sites--Conservation and restoration--Poland--Kraków.
Ojcowski Park Narodowy (Poland)
Harvard subject headings:
Acid deposition--Environmental aspects--Poland--Kraków.
Architecture--Poland--Kraków--Conservation and restoration.
Cultural property--Protection--Poland--Kraków.
Historic sites--Poland--Kraków--Conservation and restoration.
Ojcowski Park Narodowy (Poland)
Princeton subject headings: