A great paperback book of Warren's work.  This book is brand new.  Long out of print.  published in 1989 to accompany an exhibition at University of Minnesota, Minneapolis.  
includes essays and 185 pieces of his work from the 50's through the late 80's.  
Essays include:
Artist Statement (warren)
excerpt on Warren by David Lewis
Transcript of dialogue between David and Warren

60 pages of images (with description and period).  

Finally: In typical Warren fashion, he also included some work by students who most will know.  16 students in total!