Columbia subject headings:
Harvard subject headings:
Art historians--Switzerland--Correspondence.
Burckhardt, Jacob, 1818-1897--Correspondence.
Wölfflin, Heinrich, 1864-1945--Correspondence.
Princeton subject headings:
Art historians--Switzerland--Correspondence.
Burckhardt, Jacob, 1818-1897. Correspondence.
Wölfflin, Heinrich, 1864-1945--Correspondence.