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21Published 1984Subjects: “...Coal....”
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22Published 1837Subjects: “...Coal mines and mining....”
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23Published 1837Subjects: “...Coal mines and mining....”
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24Published 1837Subjects: “...Coal mines and mining....”
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25Published 1906Subjects: “...Coal mines and mining....”
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26Published 1916Subjects: “...Coal mines and mining....”
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27Published 1907Subjects: “...Coal mines and mining....”
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28
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29Published 1912Subjects: “...Coal mines and mining....”
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30Published 1912Subjects: “...Coal mines and mining....”
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31Published 1913Subjects: “...Coal mines and mining....”
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32Published 1913Subjects: “...Coal mines and mining....”
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33Published 1905Subjects: “...Anthracite coal....”
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34Published 1945Subjects: “...Coal mines and mining....”
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35Published 1930Subjects: “...Coal mines and mining....”
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36Published 1930Subjects: “...Coal mines and mining....”
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37Published 1934Subjects: “...Coal mines and mining....”
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38
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39Published 1965Subjects: “...Coal mines and mining....”
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40Published 1964Subjects: “...Coal mines and mining....”
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