1. 1
   Population description of the non-methanogenic phase of anaerobic digestion

   by Toerien, Danie Francois
   Published 1969

   Pretoria, South Africa : University of Pretoria, 1969.

   iv, 214 leaves : ill. ; 30 cm.

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2. 2
   The electrodialytic demineralisation of water with an apparatus of the multicell type; the chemical technological aspects of the process

   by Gottschal, Auko Jan
   Published 1957

   1957.

   70, 3, 4, [iv] ̋. 33 cm.

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