Dans ce trait approfondi sur le magn tisme terrestre, leuth re lie Nicolas Mascart livre une analyse scientifique rigoureuse et une th orie solide sur le sujet. 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. Within the United States, you may freely...