1. 
   Mtpa
   million tonnes per annum
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   Mtpa
   Million tonnes per annum
   Found op http://users.aber.ac.uk/zwk/distlearn/virtlib/projects/deeble/deeble.html#G
   
   
3. 
   mtpa
   1) Million tonnes per annum
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/mtpa/1
   
   

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