63,256 research outputs found

    Letter from J. R. Eakin to Arthur G. Ringland

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    Letter (copy) from J. R. Eakin to Arthur C. Ringland about the alignment of 40 acres near the Buggeln ranch

    Letter from Arno B. Cammerer to J. R. Eakin

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    Letter from Arno B. Cammerer to J. R. Eakin describing the procedure for purchasing Bright Angel Trail

    Letter from J. R. Eakin to Carl Hayden

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    Letter from J. R. Eakin to Carl T. Hayden concerning access to Rowe Well and the canyon

    Letter from J. R. Eakin to Stephen Mather

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    Letter from J. R. Eakin to Stephen T. Mather about expenses and reconstruction of the Kaibab Trail

    Letter from Carl Hayden to J. R. Eakin

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    Letter from Carl T. Hayden to J. R. Eakin regarding changes to the Grand Canyon National Park boundaries and the purchase of lands from William Randolph Hearst

    Letter from J. R. Eakin to Stephen Mather

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    Letter from J. R. Eaking to the National Park Service director about changes to the Grand Canyon National Park boundaries, and access to water near the Buggeln property on Desert View road

    [Letter from J. R. Roberts to Sister, November 24, 1878]

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    Letter from J. R. Roberts to sister. J. R. thanked his sister for gifts that were sent and went on to update her on what was happening in their families' lives. The letter ended with a mention that people were searching for land claims in the area and the author wanted their mother to not worry about them

    Letter from J. R. Eakin, Grand Canyon National Park to Carl Hayden

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    Letter from J. R. Eakin to Carl Hayden regarding the sale of Bass properties to the Santa Fe Railroad Company

    Letter from J. R. Eakin, Grand Canyon National Park to Carl Hayden

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    Letter from J. R. Eakin to Carl Hayden justifying the value of his land at twenty-five thousand dollars

    Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV

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    The prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of √s = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region
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