@article{weko_1786_1,
   author	 = "田中,豊",
   title	 = "地層って何？",
   journal	 = "とやまと自然",
   year 	 = "2003",
   volume	 = "26",
   number	 = "3",
   pages	 = "5--8",
   month	 = "oct"
}