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22by Wilkinson, Alastair James“...HV 4630.4 .C5 .W686 1980...”
Published 1980
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25by Unsworth, Robert Mark“...HQ 1236.5 .N5 .U59 1980...”
Published 1980
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38by Spence, Dave“...HE 199 .N5 .S744 1985...”
Published 1985
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39by Richards, Edward P.“...HF 2366 .R514 1986...”
Published 1986
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40by Rooney, Linda M.“...HC 60 .R777 1986...”
Published 1986
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