Columbia subject headings:
Drucker, Jean Charles Joseph, 1862-1944--Art collections--Exhibitions.
Drucker-Fraser, Maria Lydia, b. 1886--Art collections--Exhibitions.
Hague school of painting--Exhibitions.
Watercolor painting, Dutch--19th century--Exhibitions.
Harvard subject headings:
Drucker, Jean Charles Joseph, 1862-1944--Art collections--Exhibitions.
Drucker-Fraser, Maria Lydia, 1886---Art collections--Exhibitions.
Hague school of painting--Exhibitions.
Watercolor painting, Dutch--19th century--Exhibitions.
Princeton subject headings:
Drucker, Jean Charles Joseph, 1862-1944--Art collections--Exhibitions.
Drucker-Fraser, Maria Lydia, 1886---Art collections--Exhibitions.
Hague school of painting--Exhibitions.
Watercolor painting, Dutch--19th century--Exhibitions.