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On the use of input-output models for regional planning / W.A. Schaffer ; with the ass. of E.A. Laurent...[et al.].
- Nijhoff social sciences division,
- 1976.
- Leiden :
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The demand for urban water / P. Darr, S.L. Feldman, Ch. Kamen.
- Nijhoff social sciences division,
- 1976.
- Leiden :