Some rare Raiders artwork here
http://www.flickr.com/photos/kielbryant/sets/72157608548995924/
Steranko:
http://www.flickr.com/photos/23115596@N05/6148815902/in/photostream/
http://flavorwire.com/141156/see-the-original-indiana-jones-concept-art-by-jim-steranko