Concept
Version 6
Created by Boundless
Art of the Bronze Age
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"480px-Sword_bronze_age_(2nd_version).jpg."
http://commons.wikimedia.org/wiki/Image:Sword_bronze_age.JPG
Wikimedia Commons
CC BY-SA 3.0.