The "Hooked X"... "Dotted R" letters / History of Kensington Ruinstone
In, The Kensington Runestone: Compelling New Evidence, Richard Nielsen and Scott F. Wolter present new evidence in favor of the authenticity of the KRS runes, including a discussion of the Larsson letters and Wolter's petrographic analysis. The Foreword by Alice B. Kehoe, , concludes, "The notion that the Kensington Runestone is a late nineteenth-century hoax is not supported by contemporary data."
See also https://en.wikipedia.org/wiki/Kingittorsuaq_Runestone