Cauruļvada alegorija : kā jebkurš mūsdienu ekonomikā var uzbūvēt nepārtrauktu papildu ienākumu cauruļvadu!
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![TEUK XIII: taastuvate energiaallikate uurimine ja kasutamine : kolmeteistkümnenda konverentsi kogumik : [10. november 2011, Tartu] = Investigation and usage of renewable energy sources : thirteenth conference proceedings : [10th Novembe...](/arhiiv/assets/thumbdef/shelf_empty-0dd7b3d914ab0ca1d1ba007da1745a76.png)