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21Published 1989“...HE 373 .N5 .N532...”
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22Published 1973“...HE 291 .W66 s...”
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23
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24
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25Published 1970“...HE 5614.5 .N5 .N532...”
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26
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27
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28
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29Published 1994“...HE 297.5 .N532 1994...”
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30Published 1973“...HE 152 .F492...”
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31Published 1991“...HE 297.5 .N532...”
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32
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33
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34Published 1995“...HE 297.5 .T7725...”
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35Published 1995“...HE 368.2 .Z55 .E3 .N277...”
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36Published 1995“...HE 368.2 .Z55 .E3 .N2775...”
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37
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38
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39
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40Published 1996“...HE 368.2 .Z55 .E3 .E61 summary...”
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