1. Design considerations for mining thick seams and seams lying in close proximity to one another;Wilson,1976
2. Optimizing productive potential in multi-seam underground coal mining;Haycocks,1981
3. Effects on unmined seams of coal by mining coal seams above or below;Holland,1947
4. Mining seams above mined out lower seams;Lazer;Min. Eng.,1965
5. A study of problems encountered in multiple seam mining in the Eastern United States;Stemple;Bull. Va. Polytech. Inst.,1956