In a report by professor Hirayama's of Tokyo University of Agriculture in 1959, there were two examples cited, but most were buried in the ground and this was a difficult situation for restoration. |
1959年の東京農業大学の平山教授の報告書では二つの例が報告されていたがほとんど地面に埋もれ修復も困難な状況であった。 |