Mexico esta enfrentando serios problemas para cubrir las crecientes demandas de agua en gran parte de su territorio nacional, sobre todo las del sector agricola que demanda casi el ochenta…

The 18th century was a wealth of knowledge, exploration and rapidly growing technology and expanding record-keeping made possible by advances in the printing press. In its determination to preserve the…

This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either…