The Prevention of Racial Discrimination in Britain. Edited by Simon Abbott. (London: Oxford University Press for the Institute of Race Relations, 1971. Pp. xviii, 502. £ 5.00.) - The Politics of the Powerless: A Study of the Campaign Against Discrimination. By Benjamin W. HeinemanJr. (London: Oxford University Press for the Institute of Race Relations, 1972. Pp. xvi, 244. £ 4.30.) - Race and Law in Great Britain. By Anthony Lester and Geoffrey Bindman. (Cambridge, Mass.: Harvard University Press, 1972. Pp. 491. $10.00.)