Oregon Brewing History

Stan posed a question in comments to my Schwag post that has sent me down a couple dead ends: "Do you know what styles were being produced in Oregon in 1890?" This turns out to be more difficult that it appears. It seems that history doesn't capture beer so much as breweries. This is a bit of a long shot, but does anyone have any idea how you'd go about finding this information? I'd be much obliged if someone had some resources.