SOME FACTS ABOUT SECULAR VARIATION OF THE EARTHS MAGNETISM - SANDOVAL, ROSENDO OCTAVIO (OBSERVATORIO ASTRONOMICO TACUBAYA, SECCION MAGNETISMO, CD. MEXICO, DF, MEX, 1934)
TRANS AM GEOPHYS UNION
Keywords: FACTS, SECULAR, MAGNETISM; CIENCIAS DE LA TIERRA Y DEL ESPACIO