>>512
ごめんURL逆に貼ってた正解はこっち↓

https://www.archives.gov/files/iwg/japanese-war-crimes/introductory-essays.pdf
米国立公文書館が保有するものに限らず、IWGの調査前に既に公開されていた文書の中には、731部隊の人体実験を含む日本の戦争犯罪に関しての記録がある。
(例えば上のpdf 25/240ページ「Three important documents, translated from Japanese to English and each more than 100 pages long,
detail Unit 731’s clinical observations of the day-by-day spread of various pathogens through the bodies of helpless prisoners whom Japanese doctors subjected to experiments.
The U.S. government declassified these key documents, titled “The Report of A” (anthrax), “The Report of G” (glanders), and “The Report of Q” (bubonic plague) in 1960.
They are available to the public at the U.S. Library of Congress.
With relevant documents interfiled among a dozen record groups and others available—but not at the National Archives—the researcher’s task is a formidable one」)
一部日本に返還された物もあるのにそれは消息不明とのこと。(上のpdf 22/240ページ(6))

↓これも参考に
https://www.archives.gov/files/iwg/japanese-war-crimes/introductory-essays.pdf