I've thought about emailing Mr. Nageler a polite request regarding the mistakes, but even in a polite manner it might be impolite at all...Here are the links to some of his further publications (in English):
http://books.google.de/books/about/On_th...4o2vsMTdYC
http://www.asjournal.org/archive/53/164.html
http://www.nytimes.com/2009/02/16/opinio....html?_r=0
(I wonder what two dozen published biographies he is speaking of...)
Hope it's ok if I tell - you briefly mentioned an alledged Lincoln statue in Austria - could you share some details? I've never heard of this!