Some 200 million people lived on Planet Earth at the start of the modern era. That number rose to 2.5 billion by 1950. At mid-2008, the population is now 7.0 billion and is expected to reach 9.0 billion...
Groundwater is of major importance to rural development in many countries of the world. As a result of its widespread distribution, low development cost, and generally excellent quality, it has been the...
Groundwater is of major importance to rural development in many countries of the world. As a result of its widespread distribution, low development cost, and generally excellent quality, it has been the...