How did Oluf Christian Dietrichson and Fridtjof Nansen travel across the Greeland interior in 1888?
Oluf Christian Dietrichson:  He was a member of the Greenland expedition of 1888 led by Fridtjof Nansen, the first documented crossing of Greenland. Fridtjof Nansen:  He led the team that made the first crossing of the Greenland interior in 1888, traversing the island on cross-country skis.
on cross-country skis