pdf linkit talteen siitä, miten mm. Afrikasta on ollut yhteyttä Amerikkaan jo kauan ennen ns. kolumbuksen retkiä:
Wienrich – Africa and the discovery of America https://ia600303.us.archive.org/18/items/africadiscoveryo02wienrich/africadiscoveryo02wienrich.pdf
Ivan Van Sertima – They came before Columbus, The African Presence in Ancient America
https://dn790000.ca.archive.org/0/items/theycamebeforecolumbustheafricanpresenceinancientamericabyivanvansertima/They%20Came%20Before%20Columbus%20The%20African%20Presence%20in%20Ancient%20America%20by%20Ivan%20Van%20Sertima.pdf
