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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
- Figure 1. .png 742 × 940; 292 KB
- Figure 10..png 303 × 492; 48 KB
- Figure 11. .png 973 × 753; 500 KB
- Figure 12. .png 800 × 483; 86 KB
- Figure 13. .png 390 × 517; 21 KB
- Figure 14. .png 803 × 756; 160 KB
- Figure 15..png 1,090 × 410; 591 KB
- Figure 16..png 560 × 607; 239 KB
- Figure 17..png 1,532 × 687; 882 KB
- Figure 18..tif 1,281 × 1,308; 1.62 MB
- Figure 18. .png 767 × 778; 608 KB
- Figure 19..png 1,246 × 518; 129 KB
- Figure 19. .png 656 × 164; 108 KB
- Figure 2..png 772 × 948; 402 KB
- Figure 20..png 778 × 628; 234 KB
- Figure 21. .png 788 × 632; 210 KB
- Figure 22. .png 1,003 × 730; 531 KB
- Figure 23. .png 766 × 563; 215 KB
- Figure 24b. .png 592 × 407; 201 KB
- Figure 25..png 613 × 762; 243 KB
- Figure 26..png 607 × 440; 125 KB
- Figure 27..png 748 × 217; 107 KB
- Figure 28..png 1,145 × 622; 209 KB
- Figure 29..png 1,185 × 556; 161 KB
- Figure 3..png 367 × 832; 77 KB
- Figure 30..png 751 × 263; 389 KB
- Figure 31..png 694 × 500; 531 KB
- Figure 32..png 1,236 × 780; 836 KB
- Figure 33..png 560 × 543; 187 KB
- Figure 34. .png 1,220 × 625; 68 KB