Table:
text: Nordic skiing
Men's 50 km
Men's 50 km
Winner Country Winter_Olympics FIS_Nordic_World_Ski_Championships Holmenkollen
Thorleif Haug Norway 1924 1924 1918, 1919, 1920, 1921, 1923, 1924
Nils Karlsson Sweden 1948 1948 1947, 1951
Ole Ellefsæter Norway 1968 1968 1967
Pål Tyldum Norway 1972 1972 1969, 1972
Thomas Wassberg Sweden 1984 1982 1980, 1982, 1987
Gunde Svan Sweden 1988 1985, 1989 1986, 1990
Petter Northug Norway 2010 2009 2010

Question: From which country did Ole Ellefsæter come from among the Nordic skiers over 50 km?

Question: Who won the 1972 FIS Nordic World Ski Championships men's 50 km?