File:Pittsburgh freight rail density map 1921.jpg
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Size of this preview: 717 × 600 pixels. Other resolutions: 287 × 240 pixels | 574 × 480 pixels | 918 × 768 pixels | 1,224 × 1,024 pixels | 2,448 × 2,048 pixels | 6,510 × 5,447 pixels.
Original file (6,510 × 5,447 pixels, file size: 4.56 MB, MIME type: image/jpeg)