Changes in microbial communities and associated water and gas geochemistry across a sulfate gradient in coal beds: Powder River Basin, USA. - Schweitzer, Hannah; Ritter, Daniel; McIntosh, Jennifer; Barnhart, Elliott; Cunningham, Al B.; Vinson, David; Orem, William; Fields, Matthew W. (Geochimica et Cosmochimica Acta, 2019)