Have you any old eric von dankien books for sale or any books related to such topics.

Your best bet would be to check an auction site like E-bay, not sure if they have a Netherlands location, you'll have to check to see what region is closest to you, to save on shipping costs. Same with on-line bookstores like Amazon or Borders, they usually have bargin auctions on their sites.

Since Eric focuses on the evidence left behind, I suggest Sacred Illusions by R.D. Valenti. It's written as fiction, but based on research of unexplained scientific knowledge in ancient times.