== External links ==*Stone Age sailors 'beat Columbus to America' ("The Guardian", 1999)*Coming into America: Tracing the Genes (PBS, 2004)*Stone Age Columbus (BBC 2002)*Ice Age Columbus: Who Were the First Americans?
* Stone Age sailors 'beat Columbus to America' ("The Guardian", 1999)* Coming into America: Tracing the Genes (PBS, 2004)* America’s Stone Age explorers* Stone Age Columbus (BBC 2002)* Ice Age Columbus: Who Were the First Americans?