Image: The World areas covered by Commercial Air Routes
Size of this preview: 800 × 499 pixels. Other resolutions: 320 × 199 pixels | 2,070 × 1,290 pixels.
Original image (2,070 × 1,290 pixels, file size: 1.1 MB, MIME type: image/jpeg)
Description: The World areas covered by Commercial Air Routes, shown in black, in 1925
Title: The World areas covered by Commercial Air Routes
Credit: https://babel.hathitrust.org/cgi/pt?id=mdp.39015023148458
Author: Francis J. Field
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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