John L. Sorenson's book, Transoceanic Voyaging: How Ancient America Became Civilized has just been put on the Book of Mormon Central Website. Those interested in the topic of transoceanic crossings and diffusionism will enjoy it, as well as Sorenson's other works on the topic, such as the 2-volume Pre-ClumbianContact with the Americans across the Oceans: An Annotated Bibliography (with Martin Raish) and World Trade and Biological Exchanges Before 1492 (with Carol L. Johannessen).