If you check out the Ron Martin booklet about Marvel Cave, the Scientific American article is discussed in it. I am glad the two of you were able to find original copies...pretty rare...nice for those who are interested in this material. Yes, I am surprised that print material often goes for such a cheap price, even stuff over 100 years old. I recently bought a 100 year old copie of an Arkansas state history at a used and out of print book store in my area for under $10. I really thought old material like this would go for much, much more.