Teaching Principles for Training "Map Reading Skills" in "Kokuminka Geography" : Focusing on "Kyo-do no Kansatsu (Observation of Hometown)"(New Historical Research Methods for Social Studies Education: Geography, History and Civics,<Special Issue>The Project Report to Commemorate the 60th Anniversary of Establishment of Social Studies Education:The Quest for Schematization and New Methodologies of the Historical Research in Social Studies Education)