Columbia subject headings:
Architecture--Switzerland--Castel San Pietro.
Castel San Pietro (Switzerland)
Cultural property--Protection--Switzerland--Castel San Pietro.
Cultural property--Switzerland--Castel San Pietro.
Landscape protection--Switzerland--Castel San Pietro.
Urbanization--Switzerland--Castel San Pietro.
Harvard subject headings:
Architecture--Switzerland--Castel San Pietro.
Castel San Pietro (Switzerland)
Cultural property--Protection--Switzerland--Castel San Pietro.
Cultural property--Switzerland--Castel San Pietro.
Landscape protection--Switzerland--Castel San Pietro.
Urbanization--Switzerland--Castel San Pietro.
Princeton subject headings: