Hart, P. E. Concentration in British industry, 1935-75 - Cambridge : Cambridge University Press, 1980 - 164 p. : ill. ; 24 cm. - Occasional papers (National Institute of Economic and Social Research) ; 32 . ISBN: 0521233933 Subjects--Topical Terms: Industrial concentration--History--United Kingdom Subjects--Geographic Terms: United Kingdom--Manufactures--History