John Carlson (Colorado/Nebraska)

Looking for genealogy of John (?) CARLSON
Came to America in 1912 (approximately).Not sure of wife's name.
Children were:
Erik Gerhard (b 1897)
Karl Wilmer (b 1901
Oskar (b 1904)
David Gunnar (b 1906)
Steve (?) (b 1907)
Sally (b 1909)
Selma (b 1913)
Herbert (b 1915)
Please let me know if you have any information regarding this family.