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21
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22
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23
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24Published 1998“...HC 665 .N934 1998...”
Book -
25
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26
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27
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28
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29Published 1981“...HB 1 .E19 n...”
Journal -
30
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31
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32Published 1972“...HG 5980.5 .A3 .N532 i 1972...”
Book -
33
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34
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35
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36Published 1975“...HD 1120.5 .Z7 .R778...”
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37