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Recordar:
| 020 | $a92-826-2929-5 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 041 | $aInglés | ||||||||||
| 080 | $a504.453 | ||||||||||
| 090 | $aCIDIMA | ||||||||||
| 245 10 | $aRiver water quality $b: ecological assessment and control $cCommission of the European Communities. Directorate-General Environment, Nuclear Security, Civil Protection | ||||||||||
| 260 | $aLuxembourg $bOffice for Official Publications of the European Communities $c1992 | ||||||||||
| 300 | $a751 p. $bil., gráf., tab. $c30 | ||||||||||
| 650 14 | $aRíos | ||||||||||
| 650 14 | $aCalidad del agua | ||||||||||
| 710 2 | $aComisión Europea | ||||||||||
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