The clean brook.
By: Illustrated by Aldren A. Watson.
Contributors: Watson, Aldren Auld, 1917-
Series: Let's read and find out; Let's read and find out
Publisher: Crowell
Published: 1960
Place of publication: New York
Language: eng
Number of pages: 38
Subjects: Rivers.; Freshwater biology.
Description: Pictures and simple text tell how a stream in a natural state, filters out impurities like mud, leaves, bugs, and other things.