National Gallery of Art
National Gallery of Art: Gemini Artist Workshop 1966 1996
An invaluable site showing works and discussing artists who were part of the Gemini Artist Workshop. Artist include David Hockney, Andy Warhol, Nancy Kienholz and over 50 others.
Martin Lawrence Galleries
Martin Lawrence Galleries: Sam Francis
One of the masters of abstract expressionism. His works are highly related to color field painting and the drip paintings of Jackson Pollock. Here there is a biography and a collection of works from a variety of media.
NPR: National Public Radio
Npr: Color as Field: American Painting, 1950 1975
Slideshow that highlights paintings exhibited at the Smithsonian American Art Museum done by artists whose works are classified as color field painting.
Smithsonian Institution
Smithsonian American Art Museum: Sam Francis
As part of the Smithsonian Art Museum's database of artists, this site provides biographical information on Sam Francis in addition to an extensive listing of his works as displayed at the museum.