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1
Marion L. Butterfield, | INST ELEC & ELEC ENGINEERS | 2008 ,
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Butterfield, Sue, 370.924-B988e | Open University Press | 1995 370.924-B988e,
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Butterfield, Earl C, 370.18-B988a | Birch Lane Press Book | 1994 370.18-B988a,
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Butterfield, B W., 841.9-B988m | Vision Press | 1984 841.9-B988m,
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Butterfield, Jeremy., 110-B988l | Cambridge University Press | 1986 110-B988l,