#livingston-joseph
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![Capitulo_1_-_Generalidades_(3)[1]](https://static.cupdf.com/doc/330x215/55cf8c745503462b138c95f7/capitulo1-generalidades31.jpg)
![Capitulo_2_-_Perforaciones_(3)[1]](https://static.cupdf.com/doc/330x215/55cf8c745503462b138c95b3/capitulo2-perforaciones31.jpg)