We saw this painting go up for auction at Clars from the estate of the painter Robert Bechtle. There were some other pretty cool pieces from the same estate lot. I meant to post it earlier, but lost track of time and it looks like it sold for a pretty bargain price. It was from 1965. Trying to pull from the cached postings, now, it looks like it was titled Untitled (Trees).
Always looking for more! What else is still out there? I visited Empire College in Santa Rosa years ago because I knew they had two great paintings. I found one of them more recently in this clip on YouTube at the 2 minute mark. If you've got more Ruth Dicker paintings or info, let us know.