I found my old text book, The Era of Reconstruction (1865-1877) by Kenneth M Stampp to be pretty good, but like a lot of books from the centennial (i.e. books that came out during the 100 year anniversary of American Civil War from 1960-1965) it's not available as an ebook.
I would say that as with most controversial time periods, you really have to be careful to sample a range of views to get a true measure of what really happened.
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