6
   
8
Published: Santiago de Chile, Inst. Latinoamericano de Investigaciones Sociales, 1973
   
10
   
11
Published: Washington, D.C., Pan American Union, General Secretariat, Organization of American States, 1968
   
13
Published: Berlin, Dt. Inst. für Entwicklungspolitik, 1988
   
14
   
15
Published: Buenos Aires, Union de Ed. Latinos, 1956-
   
16
   
17
Published: (Cambridge), British Antarctic Survey, Natural Environment Research Council, (1985)
   
19
   
20
   

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