North of slavery the Negro in the free States, 1790-1860 - Litwack, Leon F. (University of Chicago Press, 1961)
Master and use copy. Digital master created according to Benchmark for Faithful Digital Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002
Includes bibliographical references
Examines the ante bellum racial discrimination in the states north of the Mason-Dixon line