It seems you are looking for a titled "Análisis de Precios Unitarios BIMSA" and are asking if it is a "good piece" (likely meaning a useful or high-quality resource).
However, I cannot directly provide or attach PDF files. I also do not have live access to BIMSA's proprietary internal databases or their latest price analysis documents. analisis de precios unitarios bimsa pdf
Here is what you need to know to find and evaluate that document: It seems you are looking for a titled