How clearly written are children's textbooks? Or, of bladderworts and alfa /

Bibliographic Details
Main Author:	Anderson, Thomas H.
Other Authors:	Armbruster, Bonnie B., Kantor, Robert N.
Format:	Book
Language:	English
Published:	Champaign, Ill. : Cambridge, Mass. : University of Illinois at Urbana-Champaign ; Bolt, Beranek and Newman, 1980.
Series:	Reading education report ; no. 16.
Subjects:	Textbooks > Readability. Textbooks > Research. Education, Elementary > Textbooks.