Dive Into These Unreleased Warhol Portraits of Keith Haring, Liza Minnelli & More

It's been over three decades since Andy Warhol's death in 1987, yet the pop art icon seems as in-demand as ever. In the past few years, the artist's likeness and work has appeared on Calvin Klein runways (the result of a deal between chief creative officer Raf Simons and The Andy Warhol Foundation for the Visual Arts) and in the pristine galleries at the Whitney Museum of Art, with the museum's "Andy Warhol -- From A to B and Back Again" marking the first major retrospective of the artist since 1989.

Related | Prolific Gay Artist John Giorno Reflects on His New Retrospective, Andy Warhol & AIDS

You can now add a book and yet another gallery show to the list of places Warhol has posthumously appeared. Stanford University's Cantor Arts Center recently opened "Contact Warhol: Photography Without End," drawing on a massive trove of 13,000 contact sheets and corresponding negatives. With many of the images never seeing the light of day until now, it's given a new insight into Warhol's world at both the gallery and within the corresponding photo book published by The MIT Press. Among the snapshots taken on Warhol's Minox 35EL camera, there are new images of acclaimed artist Keith Haring and his boyfriend Juan Dubose, Liza Minnelli, and more.

Click through for a peek inside the incredible new photos from "Contact Warhol: Photography Without End."

Pictured: Keith Haring and boyfriend Juan Dubose, 1983.

Photography: Cantor Arts Center collection, Gift of The Andy Warhol Foundation for the Visual Arts. (c) The Andy Warhol Foundation for the Visual Arts, Inc.