sentences:  The book was published, and the map revealed to the world, the day before Columbus Day, 1965.Many academic reviewers of the book took the opportunity to point out evidence that called the map's authenticity into question, so a year later, a Vinland Map Conference was held at the Smithsonian Institution, during which further significant questions were asked, particularly of Witten, who gave very straightforward and helpful answers; but, the proceedings were not published for another five years.There were questions about the actual content of the map.