ニューヨーク・タイムズさんのインスタグラム動画 - (ニューヨーク・タイムズInstagram)「How the U.S. Preserves Historic Documents Some U.S. founding documents are nearly 250 years old, so how do they withstand the test of time? A combination of chemicals, technology and a steady hand help preserve pieces like the Constitution. The National Archives and Records Administration has been responsible for the care of these documents since 1934. Here is a look at what it takes to keep these national icons intact. Photos and video by @jaredsoares and @globalgabrielgrey」7月23日 1時28分