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21Published 1975“...HT 395 .N52 .W4 .R336...”
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22Published 1976“...HC 623 .W4 .R439...”
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23Published 1982“...HQ 1865.5 .Z8 .W5 .I35...”
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24Published 1974“...HE 3550.5 .Z8 .W4 .W4522 1905a...”
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25Published 1993“...HT 395 .N52 .W4 .W452 p...”
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26Published 1993“...HT 395 .N52 .W4 .W452 d...”
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27Published 1993“...HQ 1865.5 .Z8 .W4 .W872...”
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28
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29
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30Published 1988“...HV 9230.4 .A6 .W4 .D0811...”
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31
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32
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33
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34
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35
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36
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37Published 1991“...HD 6079.2 .N5 .W872...”
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38
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39Published 1990“...HV 9915.5 .Z8 .W42 .W4 .C734...”
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40