Second-hand copies of Volume 3 can be found on Mercado Libre, eBay, or AbeBooks for as little as $4-$10. Purchasing a used book is legal. You can then – for – scan it into PDF and record yourself reading the exercises aloud. That gives you your own "pdf gratis sonido" (free in the sense of no additional cost, and sound via your own voice).
While "free PDF" versions circulate informally online due to the author's desire to disseminate the teachings widely, for a formal paper or citation, you should look for official editions published by or Editorial Kier . metaf%C3%ADsica 4 en 1 volumen 3 pdf gratis sonido
"The Word is the first manifestation of creation. But the Word is sound. Before the Word, there was the vibration." Second-hand copies of Volume 3 can be found