C-SPAN
C Span American Writers: Uncle Tom's Cabin
This summary of Uncle Tom's Cabin by Harriet Beecher Stowe includes the full text work as well as links to related websites.
University of Virginia
Univ. Of Virginia: Charles Dudley Warner, "The Story of Uncle Tom's Cabin"
This University of Virginia Library site provides the full text of Charles Dudley Warner's 1896 essay on Harriet Beecher Stowe's "Uncle Tom's Cabin". It includes the history of the secession crisis.