Slow sand filter maintenance : costs and effects on water quality

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100	1	⊔	‡aLetterman, Raymond D.
245	1	0	‡aSlow sand filter maintenance : ‡bcosts and effects on water quality / ‡cRaymond D. Letterman and Thomas R. Cullen, Jr.
260	⊔	⊔	‡aCincinnati, OH : ‡bU.S. Environmental Protection Agency, Water Engineering Research Laboratory, ‡c1985.
300	⊔	⊔	‡a5 p. ; ‡c28 cm.
538	⊔	⊔	‡aMode of access: Internet.
650	⊔	0	‡aWater treatment plants ‡zNew York (State) ‡xCost effectiveness.
650	⊔	0	‡aWater quality ‡zNew York (State) ‡xCost effectiveness.
650	⊔	0	‡aWater ‡xPurification ‡xSlow sand filtration ‡zNew York (State) ‡xCost effectiveness.
650	⊔	0	‡aWater ‡xPurification ‡xSlow sand filtration ‡zNew York (State) ‡xCost of operation.
700	1	⊔	‡aCullen, Thomas R.
710	2	⊔	‡aWater Engineering Research Laboratory.
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