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61
Published 1846
Record Source: Published Materials
Subjects and Genres: '; “...Coal Pennsylvania Transportation....”
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62
Published 1846
Record Source: Published Materials
Subjects and Genres: '; “...Coal Pennsylvania Transportation....”
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63
Author: Bowen, Ele.
Published 1848
Record Source: Published Materials
Subjects and Genres: '; “...Anthracite coal Pennsylvania....”
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64
Author: Dodge, Clifford H.
Published 2004
Record Source: Published Materials
Subjects and Genres: '; “...Coal Pennsylvania Clearfield County Maps....”
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65
Author: Griffith, William, 1855-
Published 1912
Record Source: Published Materials
Subjects and Genres: '; “...Anthracite coal Pennsylvania....”
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66
Published 1838
Record Source: Published Materials
Subjects and Genres: '; “...Coal Pennsylvania Transportation....”
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67
Author: Dodge, Clifford H.
Published 2005
Record Source: Published Materials
Subjects and Genres: '; “...Coal Pennsylvania Clearfield County Maps....”
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68
Published 1871
Record Source: Published Materials
Subjects and Genres: '; “...Anthracite coal Pennsylvania Periodicals....”
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69
Published 1875
Record Source: Published Materials
Subjects and Genres: '; “...Bituminous coal Pennsylvania....”
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70
Published 1875
Record Source: Published Materials
Subjects and Genres: '; “...Bituminous coal Pennsylvania....”
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71
Author: Billinger, R. D. 1899-1980.
Published 1954
Record Source: Published Materials
Subjects and Genres: '; “...Coal Pennsylvania....”
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72
Published 1865
Record Source: Published Materials
Subjects and Genres: '; “...Anthracite coal Pennsylvania Schuylkill County....”
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73
Published 1873
Record Source: Published Materials
Subjects and Genres: '; “...Anthracite coal Pennsylvania Periodicals....”
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74
Subjects and Genres: '; “...Coal--Pennsylvania--Northumberland County. Local sources...”
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75
Record Source: Published Materials
Subjects and Genres: '; “...Coal Pennsylvania Philadelphia...”

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76
Author: Shaulis, James R.
Published 2007
Record Source: Published Materials
Subjects and Genres: '; “...Coal Pennsylvania Somerset County Maps....”
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77
Author: Harvey, Isaac A.
Published 1888
Record Source: Published Materials
Subjects and Genres: '; “...Coal Pennsylvania Clinton Co....”
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78
Published 1905
Record Source: Published Materials
Subjects and Genres: '; “...Coal Pennsylvania Transportation....”
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79
Published 1937
Record Source: Published Materials
Subjects and Genres: '; “...Anthracite coal Pennsylvania....”
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80
Published 1937
Record Source: Published Materials
Subjects and Genres: '; “...Anthracite coal Pennsylvania....”
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Pennsylvania Inspectors of Mines 5 Pennsylvania. Bureau of Topographic and Geologic Survey 5 Pennsylvania 4 Pennsylvania Public Utility Commission 4 Roberts, William F. 4 Geological Survey of Pennsylvania 3 more ...