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21Government Document Book
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22Government Document Book
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23
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24
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25Published 1981Government Document Book
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26Published 1982Government Document Book
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27
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28
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29
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30
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31Government Document Serial
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32Priorities for research, extension, and higher education : a report to the Secretary of Agriculture.Government Document Serial
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33Published 1985Government Document Book
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34
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35
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36
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37
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38
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39
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40