http://www.geocities.com/Athens/Aegean/6726/websites.htm
Epigrpahy Society mentions 2 books, one likely to be critical
Feder, Kenneth L. (Ph.D.) "Frauds, Myths, and Mysteries"
Fingerhut, Eugene R. "Explorers of Pre-Columbian America?"
http://www.cryptohistory.com/index.html
Who Was Barry Fell, and Why Are They Saying Those Terrible Things About Him?
... has a few interesting links, the site is generally pro ...