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Water Quality Indicators Guide: Surface Waters / Charles R. Terrell, Patricia Bytnar Perfetti.
- 631.4
- Terrell, Charles R.
- U.S Government Printing Office,
- 1991.
- Washington :
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The economic opening of Eastern Europe / John Williamson.
- 337.47 W7291
- Williamson, John, 1937-
- Institute for International Economics,
- 1991.
- Washington :