1999
Biggs, T.H, R.S. Leighty, S.J. Skotnicki, P.A. Pearthree, T.R. Orr, and S.M. Richard. 1999. Digital Map of the Geology, Geomorphology, and Soils of the San Bernardino Valley, Southeastern Arizona. DI-15 Version 1.0.
C99BIG01NMUS
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