These lectures were originally recorded on cassette tape or Sony Minidisk recorder, and then transcribed into MP3 files. Some were recorded with a lapel microphone, and others with a stereo microphone. The former provides a clearer recording. For the 1991 - 1994 lectures, roving wireless microphones were available for the students during discussions, resulting in a better recording of their comments. Some of the recordings are truncated do to equipment failure.
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