http://www.mnh.si.edu/vikings/voyage/subset/vinland/archeo.html
An archeological site about Vinland with images and critical analysis.
http://www.econ.ohio-state.edu/jhm/arch/vinland/vinland.htm
The image of the Vinland map and the controversy about its authenticity.
http://www.pc.gc.ca/lhn-nhs/nl/meadows/natcul/vinland_e.asp
An informative Canadian Historic site with images of the Vikings' expeditions.
Finlay, Robert. How Not to (Re)Write World History: Gavin Menzies and the Chinese Discovery of America. Journal of World History. 15.2 (2004): 29 pars. 14 Jul. 2007.
http://www.historycooperative.org/journals/jwh/15.2/finlay.html
A very interesting article which severely critiques the theory by Gavin Menzies. He maintains that the Chinese fleet, trained by Zheng He, reached the Americas, New Zealand and Polynesia.
http://www.abc.net.au/4corners/content/2006/s1702333.htm
A program transcript discussing Gavin Menzies's theory that the Chinese Admiral Zheng He reached the New World with his fleet in the 1420s.
http://www.1421.tv/pages/evidence/content.asp?EvidenceID=191#
The supposed evidence of the voyages of Zheng He to America.
http://www.uh.edu/engines/epi1028.htm
Archaeological claims about the Chinese discovery of America.
http://www.millersville.edu/~columbus/tagliattini.html
A critical study about Christopher Columbus and his voyages.
http://nativeamericanrhythmes.com/library/images/canoelarge.gif
Various visual materials about the boats used by the Amerindians in the different areas of the country.