Concept
Version 6
Created by Boundless
Bronze Age Rock Carvings
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"640px-Tanun_carvings_birds.jpg."
https://commons.wikimedia.org/w/index.php?curid=392205
Wikimedia Commons
CC BY 2.5.