- Norse Discoveries and Explorations in North America, 982-1362: Leif Erikson to the Kensington Stone
- History of the Norwegian Settlements: A Translated and Expanded Version of the 1908 de Norske Settlementers Historie and the 1930 Den Siste Folkevandr
- Old Peninsula Days: Tales and Sketches of the Door County Peninsula
- Norwegians in America: The Last Migration: Bits of Saga from Pioneer Life = Original Title, Den Siste Folkevandring Sagastubber Fra Nybyggerlivet I Amerika
- America 1355-1364: A New Chapter in Pre-Columbian History