State of the world 1990 a Worldwatch Institute report on progress toward a sustainable society
| Awdur Corfforaethol: | |
|---|---|
| Awduron Eraill: | |
| Fformat: | Llyfr |
| Iaith: | English |
| Cyhoeddwyd: |
New York
W. W. Norton and Company
c1990
|
| Cyfres: | Worldwatch environmental alert series.
|
| Pynciau: |