Added a few links to the side.  
The ArtCyclopedia site will lead you to links to museums with Kline collections, so I won't duplicate here. The Beat Museum is kinda interesting in itself.  Artnet has an assortment of works on paper.  The Weatherspoon Museum has 2 pastel drawings.  No black at all! The fan letter from Hedy Lamarr is just charming, that's all.
Did a lot more drawings today, trying to layer color as he did.  Will scan and post one or two in a bit once I get them sorted out.  Still recovering from what seems like the endless party that is the Independence Day holiday around here.
More later.