Columbia subject headings:
Building stones--Preservation--Poland.
Poland--Buildings, structures, etc.
Stone buildings--Conservation and restoration--Poland.
Stone--Preservation.
Harvard subject headings:
Building stones--Preservation--Poland.
Monuments--Conservation and restoration--Poland.
Stone buildings--Conservation and restoration--Poland.
Stone--Preservation.
Princeton subject headings:
Building stones--Preservation--Poland.
Poland--Buildings, structures, etc.
Stone buildings--Conservation and restoration--Poland.
Stone--Preservation.