Knife Blade Steels - A Comprehensive Guide - Here is a good guide to the numerous different knife steels, including several of the "hi-tech" steels. Also, click on the link to hid article on forged steels.
The Viking-age Fylki (Petty kingdoms) in Norway before the unification. by jkvatterholm: Important! This is the “de jure” regions so to say. A petty king might have power in 2 or 3 of them, or they might be divided in various ways. The fylki are mostly a kind of administrative grouping, and they survived into the time of medieval Norway and beyond. The fylki had in the beginning mostly a þing each, but some went for further cooperation made bigger multi-fylki þings