sentences:  Floyd also contends that the creator of the Vinland map must have made use of an 18th-century engraving of the 1436 Bianco map by Vincenzio Formaleoni (1752–97), since the Vinland map appears to reproduce several of Formaleoni's copying errors.As controversy has swirled around the map almost since its acquisition, authorities at Yale University chose not to comment on the authenticity of the parchment document, other than to say they watch the debate with unusual interest.