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Orr, H.K. ,  [The Black Hills (South Dakota) flood of June 1972 : impacts and implications] ,  The Black Hills (South Dakota) flood of June 1972 : impacts and implications

Orr, H.K. ,  VanderHeide, T. ,  [Water yield characteristics of three small watersheds in the Black Hills of South Dakota] ,  Water yield characteristics of three small watersheds in the Black Hills of South Dakota

Orr, H.K. ,  [Watershed management in the Black Hills: the status of our knowledge] ,  Watershed management in the Black Hills: the status of our knowledge