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Ballard , Robert D., 559.63-B189d | Madison Press Books | 1995 559.63-B189d,
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Ballard, Dana H., 004.74-B189c | Prentice Hall | 1982 004.74-B189c,
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Ballard, J. G., 843-B189k | Farrar Straus and Giroux | 1991 843-B189k,
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Ballard, Robert D., 450-B189e-R | National Geographic Society | 1983 450-B189e-R,