Middle initial G? Is that how he was listed on the federal census enumerations for Steel County ND?? Do those censuses agree with your estimate of his birth year?
What year(s) did he list for his immigration on those censuses?
How was he listed in BLM land records?
Did you take advantage of the North Dakota cemetery transcription lookups?http://www.rootsweb.com/~usgenweb/nd/ndfiles.htm