This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it.This work is in the public domain in the United States of America, and possibly other nations....

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible....

The low tensile strength of concrete, attributable to the existence of micro cracks at the aggregate-matrix interface, is responsible for crack formation and crack propagation....

The impurities may be in the form of pathogenic organism, unpleasant taste and smell, excessive colour and dissolved mineral and chemicals. The decapicitating impact of using un-potable water is a great threat to human health....