Columbia subject headings:
Painters--France--Correspondence.
Painters--Spain--Correspondence.
Zuloaga, Ignacio, 1870-1945--Correspondence.
Harvard subject headings:
Painters--France--Correspondence.
Painters--Spain--Correspondence.
Zuloaga, Ignacio, 1870-1945--Correspondence.
Princeton subject headings:
Painters--France--Correspondence.
Painters--Spain--Correspondence.
Zuloaga, Ignacio, 1870-1945--Correspondence.