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Scope and Contents "Longwall Panel Development and Extraction Plan for Multiple Seam Mining": Qty-1, Form-B "A Concept for a Super Longwall System" (photo removed and transferred to Multimedia): Qty-1, Form-F "A Concept for a Super Longwall System": Qty-4, Form-B "A Concept for a Super Longwall System": Qty-1, Form-V "Advanced-Retreat Longwall": Qty-1, Form-V ...
Dates: 1913-1990