https://cris.iucc.ac.il/en/publications/copper-for-the-early-oxhide-ingots-an-egyptian-source/
Copper for the early oxhide ingots: an Egyptian source? - Israeli Research Community Portal
for theoxhide ingotsresearch communitycopperearly
https://dienekes.blogspot.com/2015/03/oxhide-ingots-in-scandinavian-rock-art.html?showComment=1426015089445
Dienekes’ Anthropology Blog: Oxhide ingots in Scandinavian rock art
Antiquity / Volume 89 / Issue 343 / February 2015, pp 191-209 Representations of oxhide ingots in Scandinavian rock art: the sketchbook o...
oxhide ingotsrock artanthropologyblogscandinavian