Researching Family In Sweden?

I would love to hear from anyone who's researched family in Sweden.  One of my Great Grandfathers, Oscar Anderson was from Sweden.  He died in New Brunswick, Canada shortly after WW1 when his children were very young.  I will be posting more about Oscar soon.

I would love to hear what your favorite Swedish resources are.  Books, online sites, genealogical societies etc.
Most of my research has been in Canada, USA and the UK so this in new territory for me.

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