Question: How did Oluf Christian Dietrichson and Fridtjof Nansen travel across the Greeland interior in 1888?

Context paragraphs:
Just a life – the story of Fridtjof Nansen: Just a life – the story of Fridtjof Nansen (Bokmål: "Bare et liv – Historien om Fridtjof Nansen" ) is a 1968 Norwegian/Soviet drama film directed by Sergei Mikaelyan, starring Knut Wigert and Veslemøy Haslund.  The film depicts three important episodes in the life of Fridtjof Nansen (Wigert): his North Pole expedition, his diplomatic work with the League of Nations and his humanitarian work during the 1930s famine in Ukraine.

Nansen International Office for Refugees: The Nansen International Office for Refugees ("French: "Office International Nansen pour les Réfugiés" ") was an organization established in 1930 by the League of Nations and named after Fridtjof Nansen, soon after his death, which was internationally in charge of refugees from war areas between 1930 and 1939.  It is noted for developing the Nansen passport which allowed stateless people to travel between countries.  It received the Nobel Peace Prize in 1938.

Fridtjof Nansen: Fridtjof Nansen ( ; 10 October 1861 – 13 May 1930) was a Norwegian explorer, scientist, diplomat, humanitarian and Nobel Peace Prize laureate.  In his youth he was a champion skier and ice skater.  He led the team that made the first crossing of the Greenland interior in 1888, traversing the island on cross-country skis.  He won international fame after reaching a record northern latitude of 86°14′ during his North Pole expedition of 1893–96.  Although he retired from exploration after his return to Norway, his techniques of polar travel and his innovations in equipment and clothing influenced a generation of subsequent Arctic and Antarctic expeditions.

Fridtjof Nansen-class frigate: The "Fridtjof Nansen"-class frigates are a class of frigates that are the main surface combatant units of the Royal Norwegian Navy.  The ships are named after famous , with the lead ship of the class bearing the name of Fridtjof Nansen, the Norwegian scientist, explorer and humanitarian.  Five ships were ordered from Spanish shipbuilder Bazan (now Navantia).  As of 2011, all five are in active service.  The total projected cost for all five ships is 21 billion kr (about USD ) .

HNoMS Fridtjof Nansen (F310): HNoMS "Fridtjof Nansen" is a frigate of the Royal Norwegian Navy.  Launched on 5 April 2006, she is the lead ship of the "Fridtjof Nansen" class of warships.

Nansen passport: Nansen passports, officially stateless persons passports, were internationally recognized refugee travel documents, first issued by the League of Nations to stateless refugees.  They quickly became known as "Nansen passports" for their promoter, the statesman and polar explorer Fridtjof Nansen.

Oluf Christian Dietrichson: Oluf Christian Dietrichson (3 May 1856 – 20 February 1942) was a Norwegian explorer and military officer.  He was a member of the Greenland expedition of 1888 led by Fridtjof Nansen, the first documented crossing of Greenland.

Fram: Fram ("Forward") is a ship that was used in expeditions of the Arctic and Antarctic regions by the Norwegian explorers Fridtjof Nansen, Otto Sverdrup, Oscar Wisting, and Roald Amundsen between 1893 and 1912.  It was designed and built by the Scottish-Norwegian shipwright Colin Archer for Fridtjof Nansen's 1893 Arctic expedition in which the plan was to freeze "Fram" into the Arctic ice sheet and float with it over the North Pole.

Fridtjof Nansen Museum: The Fridtjof Nansen Museum (Armenian: Ֆրիտյոֆ Նանսենի թանգարան ) is a museum in Yerevan, Armenia dedicated to Norwegian explorer and Nobel Peace Laureate Fridtjof Nansen's life and his scientific and humanitarian accomplishments.  The museum features books, films, posters and jubilee sculptures on scientific and humanitarian activities.

Mount Fridtjof Nansen: Mount Fridtjof Nansen is a high massive mountain which dominates the area between the heads of Strom and Axel Heiberg Glaciers, in the Queen Maud Mountains of Antarctica.  Discovered by Roald Amundsen in 1911, and named by him for Fridtjof Nansen, polar explorer, who helped support Amundsen's expedition.

Supporting paragraphs: Oluf Christian Dietrichson Fridtjof Nansen
Answer: on cross-country skis