Columbia subject headings:
Hessel, Helen, 1886-1982.
Painters--Germany--Biography.
Roché, Henri Pierre, 1879-1959.
Harvard subject headings:
Hessel, Helen, 1886-1982.
Painters--Germany--Biography.
Roché, Henri Pierre, 1879-1959.
Princeton subject headings:
Hessel, Franz, 1880-1941.
Hessel, Helen, 1886-1982--Correspondence.
Hessel, Helen, 1886-1982--Diaries.
Roché, Henri Pierre, 1879-1959--Correspondence.