I think you can get the beginners guides in ebook form if you don't want dead trees.
There aren't a ton of guides on VPB to be honest. I wrote a whitepaper on how it works, but it's not really a users' guide. http://alphapixel.com/wp-content/uploads/2015/04/OpenSceneGraph-OSG-Virtual-Planet-Builder-VPB-OSGDEM.pdf
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