Columbia subject headings:
Harvard subject headings:
Natural history--Italy--Piedmont--Guidebooks.
Natural history--Piedmont (U.S. : Region)--Guidebooks.
Piedmont (Italy)--Guidebooks.
Piedmont (U.S. : Region)--Guidebooks.
Princeton subject headings:
Natural history--Piedmont region--Guidebooks.
Piedmont region--Description and travel--Guidebooks.