United airlines
by Pauline ProehlUSA
1940
Pictorial map of the United States showing United air lines and connecting air lines.
Includes scale bar indicating "scale of flying hours.”
P.h.D. research by Kiara M Firpi Carrión
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Last Updated:
21st of February, 2021
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othercartographies@gmail.com
Last Updated:
21st of February, 2021
All Rights Reserved