1
   
2
Published: London, Allen & Unwin, 1951
   
3
   
4
   
5
   
6
   
7
Published: London [u.a.], Macmillan, 1972
   
8
Published: Geneva, United Nations, 1948
   
9
   
10
Published: New York, NY, Allen & Unwin, 1952
   
11
Published: London [u.a.], Hutchinson, 1961
   
14
Published: London, Allen & Unwin, 1950
   
15
Published: Philadelphia [u.a.], Lippincott, 1965
   
17
Published: Oxford, Clarendon Press, 1967
   
18
Published: London, Murray, 1927
   
19
Published: New York, National Bureau of Economic Research, 1962
   
20
Published: London, Hart-Davis, 1951
   

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