著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL Great Britain. Ordnance Survey,Barnstaple and Ilfracombe,,Ordnance Survey,1987,"1:50,000 landranger series",,0319221806,,https://cir.nii.ac.jp/crid/1130000797464443648