1975年の下北半島の航空写真を見て回る
https://mapps.gsi.go.jp/map-lib-api/contentsImageDisplay.do?specificationId=1105232&isDetail=true
https://mapps.gsi.go.jp/map-lib-api/contentsImageDisplay.do?specificationId=1098139&isDetail=true
https://mapps.gsi.go.jp/map-lib-api/contentsImageDisplay.do?specificationId=1102022&isDetail=true
https://mapps.gsi.go.jp/map-lib-api/contentsImageDisplay.do?specificationId=1102637&isDetail=true
https://mapps.gsi.go.jp/map-lib-api/contentsImageDisplay.do?specificationId=1102026&isDetail=true
https://mapps.gsi.go.jp/map-lib-api/contentsImageDisplay.do?specificationId=1100851&isDetail=true