国立アメリカ歴史博物館のインスタグラム(amhistorymuseum) - 3月27日 05時33分

The engineer in charge of the improvements of Missouri River infrastructure. The photos are quite beautiful. "Week by week, this is how engineers built America," said museum fellow Allison Marsh.

[BIHAKUEN]UVシールド(UVShield)

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