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- 83-line.png 620 × 420; 420 KB
- Angle draw.jpg 585 × 936; 99 KB
- Blind-room-and-pillar.jpg 1,842 × 2,489; 507 KB
- Bosses fig29.2.png 735 × 346; 209 KB
- C530.jpg 120 × 165; 17 KB
- Checkerboard-room-and-pillar.jpg 1,861 × 2,513; 443 KB
- Coal Mine Statistics.png 620 × 419; 57 KB
- Coal industry.png 620 × 420; 307 KB
- Coal mines.png 620 × 420; 432 KB
- Coal mining methods high.jpg 952 × 537; 154 KB
- Coal pubs.png 602 × 401; 290 KB
- Coalgis.png 602 × 402; 335 KB
- County coal.png 602 × 402; 102 KB
- County coal data.png 620 × 420; 99 KB
- Cover.png 1,065 × 921; 673 KB
- Directory.png 602 × 402; 76 KB
- Fig43.png 603 × 393; 203 KB
- Fig 15.png 722 × 276; 196 KB
- Fig 16.png 377 × 401; 86 KB
- Figure38.png 373 × 330; 117 KB