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Industrial Combination 1938 D H Macgregor 270pp The Tendency Towards Industrial Combination 1913 George R Carter 414pp The Trust Movement in British Industry 1907 Henry W Macrosty 414pp Trusts in British Industry 1922 J Morgan Rees 277pp The Dynamics of Industrial Combination 1931 H A Marquand 214pp American Business Enterprises 1907 Douglas Knoop 123pp International Combines in Modern Industry 1934 Alfred Plummer 200pp The Structure of Competititve Industry 1931 E A G Robinson 189pp
Florence et al. (Tue,) studied this question.