reply re: "What art museums in the country administer historic sites or
house museums?"

The Demuth Foundation (114 E. King St. Lancaster, PA 17602) is sited in
the pre-revolutionary home of avant garde American modernist artist
Charles Demuth (1883-1935).  Museum is a not for profit private
institution. Home and garden are restored, but not furnished except for
Demuth's  painting studio.

Carol Morgan, Director