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Platform of the Free Soil National Convention (1848).
2000s, The Real Abraham Lincoln: A Debate (2002), The Right of Secession Is Not the Right of Revolution
2000s, The Real Abraham Lincoln: A Debate (2002), The Lincoln-Douglas Debates
2000s, The Real Abraham Lincoln: A Debate (2002), The Right of Secession Is Not the Right of Revolution
                                        
                                        James M. McPherson.  Battle Cry of Freedom http://historynewsnetwork.org/blog/153655 (1988) p. 214 
1980s
                                    
James McPherson, Battle Cry of Freedom http://historynewsnetwork.org/blog/153655 (1989), p. 214.
                                        
                                        As quoted in  His Brother's Blood: Speeches and Writings, 1838–64 https://books.google.com/books?id=qMEv8DNXVbIC&pg=PA193&lpg=PA198 (2004), edited by William Frederick Moore and Jane Ann Moore, p. 198 
1860s, Speech to the U.S. House of Representatives (April 1860)
                                    
                                        
                                        James M. McPherson.  Battle Cry of Freedom http://historynewsnetwork.org/blog/153655 (1988) p. 241 
1980s
                                    
1850s, The House Divided speech (1858)
“I freed a thousand slaves. I could have freed a thousand more if only they knew they were slaves.”
                                        
                                        Attributed to Tubman in Dorothy Winbush Riley,  My Soul Looks Back 'Less I Forget https://books.google.com/books?id=KpcLAQAAMAAJ&focus=searchwithinvolume&q=%22c.+1865%22 p. 148 (1993). Riley gives a date of "c. 1865" but offers no citation.  No source from earlier than 1993 is known. Quoted in Africana: The Encyclopedia of the African and African American Experience (1999) by Henry Louis Gates and Kwame Anthony Appiah, p. 299. Tubman specialists like Jean H. Humez and Kate Clifford Larson deem this one completely spurious. See  "Bogus Tubman," by Steve Perisho http://liberlocorumcommunium.blogspot.com/2014/03/bogus-tubman-i-freed-thousands-of.html.<!-- Someone cited this as being in Harriet, The Moses of Her People (1886) by Sarah H. Bradford, but it does not occur in the editions available online. --> 
Disputed 
Variant: I freed thousands of slaves. I could have freed thousands more, if they had known they were slaves.
                                    
 
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                        