User:Maralia/United States Mail Steamship Company
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- De la Padra, Rene (1994). A Historical Dictionary of the U.S. Merchant Marine and Shipping Industry: Since the Introduction of Steam. Greenwood Press. ISBN 9780313272257.
- United States Mail Steamship Company (1920) was a different company, formed by the US Shipping Board with seized German ships, operated by United States Lines. [2]