Columbia subject headings:
Harvard subject headings:
Amato Pojero, G. (Giuseppe), 1863-1940--Correspondence.
Philosophers, Modern--Italy--Correspondence.
Philosophy, Modern--19th century.
Philosophy, Modern--20th century.
Vailati, Giovanni, 1863-1909--Correspondence.
Princeton subject headings:
Amato Pojero, G. (Giuseppe), 1863-1940--Correspondence.
Philosophers, Modern--Italy--Correspondence.
Philosophy, Modern--19th century.
Philosophy, Modern--20th century.
Vailati, Giovanni, 1863-1909--Correspondence.