Correspondence with:
Driessen, Fr. H.
Ginsberg, Olga
Heybroek, Inge
Heybroek-Van Eeghen, Augusta
Langelaan, J.A.
Mendelsohn, Erich
Mendelsohn, Louise
Mommens, Norman
Roland Holst, Henriette
Westerman-Holstein, Wijda
Wright, Frank Lloyd