1
by Harrold, Stanley.
Published 2010
Subjects: ...Slavery -- United States -- History -- 19th century....
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2
Published 2012
Subjects: ...Slavery -- United States -- Extension to the territories....
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3
by Blackett, R. J. M., 1943-
Published 2013
Subjects: ...Slavery -- United States -- Legal status of slaves in free states....
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