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    REFERENCE_DESC                = "Elphic, R.C., D.J. Lawrence, 
    W.C. Feldman, B.L. Barraclough, S. Maurice, A.B. Binder, and P.G. Lucey, 
    Lunar rare earth element distribution and ramifications for FeO and TiO2: 
    Lunar Prospector neutron spectrometer observations,
    J. Geophys. Res., Vol. 105, No. E8, pp. 20,333-20345, 2000."
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    REFERENCE_DESC                = "Gasnault, O., W.C. Feldman, S. Maurice,
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    REFERENCE_DESC                = "Lawrence, D.J., S. Maurice, and
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    T.H. Prettyman, Improved modeling of Lunar Prospector neutron 
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    REFERENCE_DESC                = "Maurice, S., D.J. Lawrence, W.C. Feldman,
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    doi:10.1029/2003JE002208, 2004."
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    REFERENCE_DESC                = "Prettyman, T.H., J.J. Hagerty, R.C. 
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    Elemental composition of the lunar surface: Analysis of gamma ray 
    spectroscopy data from Lunar Prospector, J. Geophys. Res., Vol. 111, 
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