Columbia subject headings:
Leonardi, Leoncillo, 1915-1968--Notebooks, sketchbooks, etc.--Exhibitions.
Harvard subject headings:
Leonardi, Leoncillo, 1915-1968--Notebooks, sketchbooks, etc.--Exhibitions.
Princeton subject headings:
Leonardi, Leoncillo, 1915-1968--Notebooks, sketchbooks, etc--Exhibitions.