United States. Post Office Department & ProQuest (Firm). (1858). Letter from the Postmaster General, in reference to the transportation of the United States mail by ocean steamers, &c. [publisher not identified].
Chicago Style (17th ed.) CitationUnited States. Post Office Department and ProQuest (Firm). Letter from the Postmaster General, in Reference to the Transportation of the United States Mail by Ocean Steamers, &c. Washington: [publisher not identified], 1858.
MLA (9th ed.) CitationUnited States. Post Office Department and ProQuest (Firm). Letter from the Postmaster General, in Reference to the Transportation of the United States Mail by Ocean Steamers, &c. [publisher not identified], 1858.
Warning: These citations may not always be 100% accurate.