Global distribution of material stocks: iron, copper and nickelKenichi Nakajima, Ichiro Daigo, Keisuke Nansai, Kazuyo Matsubae, Wataru Takayanagi, Makoto Tomita and Yasunari MatsunoMatériaux & Techniques, 105 5-6 (2017) 511DOI: https://doi.org/10.1051/mattech/2017040