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Recordings of interviews and speeches and DVD's of documentaries are examples of..

AGovernment documents
BHistorical Records
CVertical Files
DAudiovisual aids

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Answer: D. Audiovisual aids

Recording of interviews and speeches and DVD's of documentaries are examples of audiovisual aids. Audiovisual aids are sources of information in the form of audio and video. These can be extremely useful resources for research, as they can contain nuanced information that is impossible to obtain from a text. Because of their usefulness, most libraries have a significant audiovisual collection.