1. 1
   Rapport oor 'n malaria-ondersoek in die Unie van Suid-Afrika

   by Swellengrebel, N. H. (Nicolaas Hendrik), b. 1885
   Published 1931

   Pretoria : Staatsdrukker, 1931.

   47 p. ; 34 cm.

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2. 2
   Report on investigation into malaria in the Union of South Africa

   by Swellengrebel, N. H. (Nicolaas Hendrik), b. 1885
   Published 1931

   Pretoria : Govt. Printer, 1931.

   45 p. ; 34 cm.

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