File:Armour's Food Source Map - The Greatness of the United States is Founded on Agriculture - verso.jpg
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Size of this preview: 800 × 508 pixels. Other resolutions: 320 × 203 pixels | 640 × 406 pixels | 1,024 × 650 pixels | 1,280 × 812 pixels | 2,560 × 1,624 pixels | 23,301 × 14,785 pixels.
Original file (23,301 × 14,785 pixels, file size: 45.8 MB, MIME type: image/jpeg)