Unit Title	Author	Year
Seminar: How Critical Elements Make Up our Modern World
Critical Metals and Their Real-World Applications	Ariel Coff	2021
Keywords: earth metals, mining, periodic table
Seminar: The Marcellus Shale and Pennsylvania: Energy, Money, Trout
Freshwater and Marcellus Shale Mining	Deborah Smithey	2011
Keywords: energy, marcellus shale, mining, pH, pollution