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River as regional bonds: the Columbia-Snake example
Ullman, Edward L., (1951)
Study of development of upper Columbia River Basin, Canada and United States
Neuberger, Richard L., (1955)
Design of Studies for Development of BPA Fish and Wildlife Mitigation Accounting Policy Phase II, Volume II, 1985-1988 Technical Report.
Kneese, Allen V., (2008)
Britain and Europe
Watkins, Ernest, (1955)