http://www.kunsthaus.ch/en/library/digital-library/picture-databases/?redirect_url=title%3DM%D0%A0%C2%A0%D0%B2%D0%201a%D1%161%D0%A0%E2%20ac%2122%D0%2019%C2%A9tho

Kunsthaus Zürich

Picture Databases

Image Search of Search Engines

Bing

Flickr

Google

Yahoo

Picture Archives

Deutsche Fotothek

Photography

Magnum Photos