TY  - BOOK
AU  - Hennings,George
AU  - Hennings,Dorothy Grant
TI  - Keep Earth clean, blue & green: environmental activities for young people 
SN  - 0590074601
PY  - 1976///
CY  - New York
PB  - Citation Press
KW  - Environmental education
KW  - Environmental protection
KW  - Study and teaching
N1  - Bibliography: p. 227-236
ER  -