NOVA, Season 43, Episode 19, Treasures of the Earth - Metals
directed by Terri Randall, fl. 1997-2019; produced by Lin Sun, fl. 2016, Lin Zhang, fl. 2014 and Terri Randall, fl. 1997-2019, WGBH Educational Foundation and NOVA, in NOVA, Season 43, Episode 19 (Arlington, VA: Public Broadcasting Service, 2016), 53 mins
