Columbia subject headings:
Pontresina (Switzerland)--Buildings, structures, etc.
Towers--Conservation and restoration--Switzerland--Pontresina.
Harvard subject headings:
Pontresina (Switzerland)--Buildings, structures, etc.
Towers--Conservation and restoration--Switzerland--Pontresina.
Princeton subject headings:
Pontresina (Switzerland)--Buildings, structures, etc.
Towers--Conservation and restoration--Switzerland--Pontresina.