Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Fujihira Masatoshi,Educational practice report using Four-dimensional digital globe “Dagik Earth”,Proceedings of the Annual Conference of the Japanese Society of Digital Textbook,2188-062X,Japan Society of Digital Textbook,2017,6,0,1-2,https://cir.nii.ac.jp/crid/1390282680815209344,https://doi.org/10.20755/jsdtp.6.0_1