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21Published 2000“...HX 806 .U911 2000...”
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22
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23
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24
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25Published 2001“...HV 1449 .L6232 2001...”
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26
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27
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28
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29Published 1969“...HC 253 .N277 1969...”
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30
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31
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32
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33
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34Published 1987“...HQ 1180 .P178 1987...”
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35
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36
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37Published 2008“...HD 6220.4 .P976 2008...”
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38
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39
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40