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HealthyCounted ratings come from accounts older than 7 days and were made on or after publication. Finished readers weigh ×1.0. Readers who have not finished yet weigh ×0.5. Did-not-finish ratings are shown but not counted.
Editions
3 editions- Other · English · 1976Penguin Books · 304 pages · 9780140700480
- Other · English · 1976Wildwood House · 304 pages · 9780704501492
- Other · English · 1976Pantheon Books · 304 pages · 9780394730936
Human ecologyTechnology
