Environmental education programs and materials
By: by Stanley L. Helgeson ... [et al.]
Series: PREP report -- no. 33
Publisher: U.S. Dept. of Health, Education, and Welfare/Office of Education, National Center for Educational Communication; U.S. Govt. Print. Off.
Published: 1972
Place of publication: Washington
Language: eng
Number of pages: 99
Subjects: Conservation of natural resources -- Study and teaching.