File:Coal mining, Anthracite Region, Pennsylvania. A miner testing the roof, following a blast (63551).jpg
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Size of this preview: 800 × 501 pixels. Other resolutions: 320 × 200 pixels | 640 × 401 pixels | 1,024 × 642 pixels | 1,280 × 802 pixels | 2,560 × 1,604 pixels | 3,309 × 2,073 pixels.
Original file (3,309 × 2,073 pixels, file size: 3.22 MB, MIME type: image/jpeg)