File:1928 - Heilman Boiler Works - 19 May MC - Allentown PA.jpg
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Size of this preview: 509 × 599 pixels. Other resolutions: 204 × 240 pixels | 408 × 480 pixels | 652 × 768 pixels | 870 × 1,024 pixels | 1,739 × 2,048 pixels | 4,214 × 4,962 pixels.
Original file (4,214 × 4,962 pixels, file size: 3.53 MB, MIME type: image/jpeg)