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The best resource for locating congressional hearing transcripts is ProQuest Congressional, a subscription database. I would recommend checking with a local academic or law library to see if this resource is available to you.
Hearings can often be found freely available online as well. I'd recommend searching sites like Hathi Trust, the Internet Archive, and Google Books.
Within the National Archives, congressional hearings are held by the Center for Legislative Archives. The CLA preserves and makes available to researchers the historical records of the U.S. House of Representatives and the U.S. Senate. You can submit a request to archivists with the Center for Legislative Archives by emailing email@example.com.