Over 200 works, including some paintings by Warhol, collected by Dennis Hopper will soon be auctioned. The auction house Christie’s aim to fetch over 13 million dollars, in two stages. 35 works will go under the hammer on 21 and 22 September in New York, and 200 more will be offered in January. A painting “Without title”, by Jean-Michel Basquiat, should go for 5-7 millions.