Columbia subject headings:
Building stones--Deterioration.
Historic buildings--Conservation and restoration--Sweden--Gotland.
Sandstone buildings--Conservation and restoration--Sweden--Gotland.
Sandstone--Deterioration.
Weathering of buildings--Sweden--Gotland.
Harvard subject headings:
Building stones--Deterioration
Historic buildings--Conservation and restoration--Sweden--Gotland.
Sandstone buildings--Conservation and restoration--Sweden--Gotland.
Sandstone--Deterioration.
Weathering of buildings--Sweden--Gotland.
Princeton subject headings: