Olien, Rebecca,

Cleaning water / by Rebecca Olien. - [New edition] - 24 pages : illustrations ; 21 cm - First facts. Water in our world .

Includes bibliographical references and index.

"Describes how cities treat freshwater so that it is safe to drink"--

Ages 7-9 K to grade 3

ISBN: 9781491482780 (library binding) 9781491482827 (pbk.)

LCCN: 2015026115

Subjects--Topical Terms:
Water
Water-supply

LC Class. No.: TD430 / .O42 2016

Dewey Class. No.: 628.1/62