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平台:
EBSCOhost AAS - American Civil War 1855-1868
(Available from 1855/01/01 until 1868/12/31.)
EBSCOhost AAS - American Political Periodicals 1715-1891
(Available from 1850/06/01 until 1877/05/31.)
EBSCOhost AAS - Periodicals of the American West 1779-1881
(Available from 1850/06/01 until 1877/05/31.)
Periodical Archive Online (HUSO)
(Available from 1850 until 1900.)