C. W. Langenberg

• Coal geology and its application to coal bed methane reservoirs
• Polyphase deformation in the Canadian Shield of northeastern Alberta
• Polyphase deformation in the eastern Sierra de los Filabres north of Lubri n, SE Spain
• Polyphase deformation in the eastern Sierra de los Filabres north of Lubrín, SE Spain
• Polyphase metamorphism in the Canadian Shield of northeastern Alberta