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Audiotapes
1962, Zürich, Switzerland (18 hours)
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1974, Wilmington, DE (25 hours)
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1975, Wilmington, DE (23 hours)
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1977, Wilmington, DE (31 hours)
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1977, Wilmington, DE (2.5 hours)
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1978, Wilmington, DE (28 hours)
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1979, Wilmington, DE (27 hours)
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1980, Elizabethtown, PA (25 hours)
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1981, Elizabethtown, PA (26 hours)
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1970, Ogunquit, ME (27 hours)
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1976, Wilmington, DE (25 hours)
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1984, Elizabethtown, PA (8 hours)
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1984, Whittier, CA (7 hours)
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1984, Elizabethtown, PA (8 hours)
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1984, Elizabethtown, PA (2 hours)
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1984 Whittier, CA (2 hours)
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1958, London, UK (8 hours)
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1986, Cazenovia, NY (7 hours)
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1986, Cazenovia, NY (10 hours)
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1957, London, UK (31 hours)
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1958, London, UK (8 hours)
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1982, Elizabethtown, PA (25 hours)
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1978, Wilmington, DE (17 hours)
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1978, Wilmington, DE (6 hours)
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1978, Wilmington, DE (13 hours)
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1966, London, UK (8 hours)
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1981, Elizabethtown, PA (26 hours)
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1957, London, UK (14 hours)
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1979, Wilmington, DE (5 hours)
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1979, Wilmington, DE (17 hours)
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