Water. Unit 7, Water supply and sewage treatment /

Water. Unit 7, Water supply and sewage treatment / Prepared by the Course Team. - Milton Keynes : The Open University, 1995. - 2nd ed. 101 p. : ill.(some col.) ; 30 cm. - Environmental control and public health. .

Technology : a second level course.

Includes bibliographical references.

0749272988 (pbk.)