Some links for sites on Willem de Kooning
Museum pages:
Guggenheim Museum
The Guggenheim museum, N.Y.
Museum of Modern Art
The Museum of Modern Art, N.Y.
National Gallery of Art.
The National Gallery of Art.
Hirshhorn Museum
The Hirshhorn Museum and Sculpture Garden, Washington, D.C. The world's largest museum collection of De Kooning's work.
Artseensoho
Artseensoho, N.Y. Drawings on paper and vellum.
Tate Gallery
Tate Gallery, London.
Stedelijk Museum
Stedelijk Museum, Amsterdam.
Gallery pages and other museums: see the various links in the list of published works.
Other pages:
The De Kooning Foundation
Official site, coming forth from the De Kooning inheritance.
Artnet
A service page on behalf of galleries. It offers images as well as information about dozens of works by De Kooning, that are for sale.
Askart
Various information and images for free, otherwise for members.
Artchive
Mark Harden's art site.
Christies
The sold lots archive of Christies returns various pages of sold works over the past years.
Sothebys
Idem for Sotheby's.