Columbia subject headings:
Landscape architecture--Italy--Trivero--Exhibitions.
Porcinai, Pietro, 1910-1986--Exhibitions.
Zegna Ermenegildo & figli--Exhibitions.
Harvard subject headings:
Landscape architecture--Italy--Trivero--Exhibitions.
Porcinai, Pietro, 1910-1986--Exhibitions.
Zegna Ermenegildo & figli--Exhibitions.
Princeton subject headings:
Landscape architecture--Italy--Trivero--Exhibitions.
Porcinai, Pietro, 1910-1986--Exhibitions.
Zegna Ermenegildo & figli--Exhibitions.