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Crossing Greenland : survival and exploration with J.P. Koch & Alfred WagnerCrossing Greenland : survival and exploration with J.P. Koch & Alfred Wagner

Guðmundur Freyr Úlfarsson 1970; Vigfús Sigurðsson 1875-1950 (Guðmundur Freyr Úlfarsson 1970, 2023)
Median crossover accident analyses and the effectiveness of median barriersMedian crossover accident analyses and the effectiveness of median barriers

Guðmundur Freyr Úlfarsson 1970 (Washington State Department of Transportation, 2004)
Um þvert Grænland : lífsbarátta og landkönnun með J.P. Koch & Alfred WegenerUm þvert Grænland : lífsbarátta og landkönnun með J.P. Koch & Alfred Wegener

Guðmundur Freyr Úlfarsson 1970; Vigfús Sigurðsson 1875-1950 (Guðmundur Freyr Úlfarsson 1970, 2023)

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