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Structure of Herrin (no. 6) Coal seam near Duquoin
- "Structure of Herrin (No. 6) Coal Seam Near Duquoin"
- "Structure of Herrin (no. 6) Coal seam near Duquoin"@en
- "Structure of Herrin, (no 6) Coal seam near Duquoin, by D. J. Fisher"