I have now added to my Classic Reprints series A Northern Defense of Secession and Rejection of the Civil War (50 pages, hardcover, $15). This is a reprint of two works written near the beginning of the Civil War by the northern Congregational minister George W. Bassett (1812-1880):

A Northern Plea for the Right of Secession
A Discourse on the Wickedness and Folly of the Present War

For details see Classic Reprints.