An audio letter is an audio recording sent by postal mail to a recipient. The practice was more common when charges for long-distance telephone services were higher and before the widespread use of the Internet.
Discovered audio recordings offer a unique perspective into that time period and have often been used to present historical context in modern-day radio and television programs.
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Letter from Birmingham Jail - Martin Luther King Jr.
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The Key to the True Kabbalah-Audio- Letter Correspondence
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MARTIN LUTHER KING JR A AUDIO LETTER FOR THE JAILED & OPPRESSED
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Media
Media used in recording audio letters include: