Lapp Influence on the Use of Skis in Exploration [Summary of a lecture on “The role of Swedish Lapps in the development of ski-ing”, given by Petter Spik, Sirkas, Norrbottens Iän, to his fellow students at the Lapp Folk High School, Jokkmokk, on 8 March 1947. Manuscript lent by DrE. J. Lindgren.] (Polar Record, 1948)