KOPPERUD Oscar
Bøker : Walsh heritage : a story of Walsh county and its pioneers, Vol. 1
mellom 1925
og 1975
Grafton, North Dakota, Amerikas forente stater
KOPPERUD Eddie
Bøker : Grafton illustrated 1882-1982, a 100 year look at Grafton, North Dakota
mellom 1925
og 1975
Grafton, North Dakota, Amerikas forente stater