Where can one find a picture of Karel Appel's 1949 fresco that was covered up for ten years?

In 1949 Karel Appel completed a fresco for the cafeteria of the city hall in Amsterdam, which created such controversy that it was covered for ten years.

For images by this artist, go to your favorite home page, click on images, and type his name in the search box.

per timeline index.com:

Karel Appel >

"Karel Appel was born on April 25, 1921, in Amsterdam. From 1940 to 1943 he studied at the Rijksakademie van Beeldende Kunsten in Amsterdam. In 1946 his first solo show was held at Het Beerenhuis in Groningen, Appel was influenced first by Pablo Picasso and Henri Matisse, then by Jean Dubuffet. He was a member of the Nederlandse Experimentele Groep and established the COBRA movement in 1948 with Constant, Corneille, and others"