Book Reviews : The Frontier Against Slavery—Western Anti-Negro Prejudice and the Slavery Extension Controversy. By EUGENE H. BERWANGER (Urbana, Chicago; London, University of Illinois Press, 1967). 176 pp. 56s. $5.95. The Freedmen's Bureau in South Carolina. 1865-1872. By MARTIN ABBOTT (Chapel Hill, The University of North Carolina Press; London, Oxford University Press, 1968). viii + 162 pp. 47s. 6d. Dynamics of Reform; the Antislavery Crusade, and Others; with Something about the Negro. By LOUIS FILLER (Yellow Springs, Ohio, Antioch Press, 1967). 16 pp