I cracked into this last night after a big week of class:
Brand: Foxon Park Diet White Birch Soda.
Origin: East Haven, Connecticut.
Purchase Place: "Minnesota's Largest Candy Store," Jordan, MN.
Review: This smelled a lot like root beer. It tasted like a creamy, weak root beer with lots of carbonation. It had the typical diet soda issue: the flavor was weak. It wasn't bad, but it was nothing special. I'll give this an average score.
Score: 5 out of 10.