| web | https://www.researchgate.net/profile/Raymond-Bradley/publication/200033707_What_Drives_Societal_Collapse/links/0deec52c46590139d2000000/What-Drives-Societal-Collapse.pdf |
| author | Harvey Weiss and Raymond S. Bradley |
| publication | Science |
| date | 2001-01-01 |
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