“Working Group on Issues of Land with Unknown Owners” of the Japan Federation of Bar Associations, to which Mr. Masato Yamanaka belongs, has published a book titled as Commentary on New Land Ownership Legislation – Amendments to the Civil Code, etc. and Practical Measures Related to Land of Unknown Ownership”from Yuhikaku Publishing Co., Ltd. Summary is described at http://www.yuhikaku.co.jp/books/detail/9784641138759