Re: ANOTHER question...
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I think you might find the following link interesting.
R1a1a and Subclades Y-DNA Project - Background
If you scroll down to the R1a Clades (by SNP markers) chart, you will see that the R1a1a1g3a Haplogroup is represented as being of Viking decent. This is my wife's father's haplogroup.
Are you a member of the R1a1a1g3a Haplogroup?