P. J. Bethell

Process improvements recover 250,000 tpy at Martin Country Coal: committing manpower and money to systematic problem solving pays off

P. J. Bethell, 1986 .

Arch coal upgrades a classic west Virginia prep plant: Holden No. 22 evolves from 1970s "By zero" technology to modern, efficient fine coal recovery

P. J. Bethell, Chuck Waine, 2008 .

Designing the coal preparation plant of the future

P. J. Bethell, Klima, B. J. Arnold, 2007 .

Economic factors affecting coal preparation: plant design worldwide and case studies illustrating economic impact

P. J. Bethell, P. Bethell, 2013 .