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61by Abbott, Carl, 1944-“...Colorado History. http://id.loc.gov/authorities/subjects/sh85028670...”
Published 1994
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63
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64by Baars, Donald L.Subjects: “...Geology Colorado Plateau Region....”
Published 1993
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65by Pearce, Sarah J.Subjects: “...Historic sites Colorado Aspen Guidebooks....”
Published 1990
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66Published 1995Subjects: “...Silver mines and mining Colorado Georgetown History....”
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67by Mutel, Cornelia FleischerSubjects: “...Natural history Colorado. http://id.loc.gov/authorities/subjects/sh2010103423...”
Published 1992
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68by Hess, Karl, 1947-Subjects: “...Nature conservation Colorado Rocky Mountain National Park....”
Published 1993
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69by Crumbo, KimSubjects: “...Rafting (Sports) Colorado River (Colo.-Mexico) History....”
Published 1981
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70by Scamehorn, H. Lee (Howard Lee), 1926-Subjects: “...Fossil fuels Colorado History 19th century....”
Published 2002
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71by Gulliford, AndrewSubjects: “...Oil-shale industry Colorado History....”
Published 1989
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72by Salcedo-Chourré, TracySubjects: “...Hiking Colorado Boulder Region Guidebooks....”
Published 2000
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73by Evans, Howard EnsignSubjects: “...Natural history Colorado Cache la Poudre River Region....”
Published 1991
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74by Varnell, JeanneSubjects: “...Women Colorado Biography....”
Published 1999
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75Published 1998Subjects: “...Natural history Colorado Plateau....”
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76
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77by Scamehorn, H. Lee (Howard Lee), 1926-Subjects: “...Pioneers Colorado Biography. http://id.loc.gov/authorities/subjects/sh2010106448...”
Published 1995
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78by Comer, Douglas C.Subjects: “...Frontier and pioneer life Colorado Bent's Fort....”
Published 1996
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79by Noel, Thomas J. (Thomas Jacob)Subjects: “...Bars (Drinking establishments) Colorado Denver History....”
Published 1996
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80by Sprague, MarshallSubjects: “...Gold mines and mining Colorado Cripple Creek....”
Published 1979
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