Google歴史Earth
http://bbs.keyhole.com/ubb/z0302a1700/rumsey.jpg
There is new information in the "Featured Content" layer, including the "Rumsey Historical Maps" sub-layer which allows you to compare historical maps from as far back as 1680 to the new world.
だって。
見てみよう。
.....
見れない。
これも"日本では使えないコンテンツ"なのか。