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The beginnings of the true railway mail service and the work of George B. Armstrong in founding it
- "George B. Armstrong, founder of the Railway Mail Service"
- "The beginnings of the true railway mail service and the work of George B. Armstrong in founding it"@en
- "The beginnings of the true railway mail service : and the work of George B. Armstrong in founding it"@en
- "The beginnings of the true Railway Mail Service and the work of George B. Armstrong in founding it"