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2Published 1979“...HN 690.8 .P879...”
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8
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12Published 1987“...HC 79 .P6 .D997...”
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15Published 1985“...HD 9000.5 .H936...”
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16Published 1974“...HV 43 .P879...”
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19Published 1969“...HC 110 .P6 .O58...”
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