1
   
2
Published: [1891]
   
3
   
5
Published: Hamburg, Afrika-Verein e.V., Techn.-Wirtschaftl. Dienst, 1965
   
9
Published: Bocholt, Temming, 1984
   
11
   
12
Published: 1990
   
13
Published: Darmstadt, Elsner, 1957
   
14
Published: St. Katharinen, Scripta-Mercaturae-Verl., 1994
   
15
   
16
   
17
Published: Zürich, Schweizer. Bankges., Volkswirtschaftl. Abt., 1983
   
19
   
20
   

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