Russell and Leona Sjogren were my uncle and aunt, if this is the same Russell and Leona. My mother was Maxine Zimmermann and there was a Darrow someplace in the family. Their marriage dates would be about right. I think they were originally from around the Duluth Minnesota area. I think Leona was born in Nebraska, as was my mother.
Don't know if any of this helps, but feel free to contact me, even if just to set me straight.
Cheers
Fred Earel