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| Obstacles to Sustainability - In Public Discourse | 353 | 
| May 2025 | June 2025 | July 2025 | August 2025 | September 2025 | October 2025 | November 2025 | |
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| Obstacles to Sustainability - In Public Discourse | 0 | 0 | 7 | 3 | 9 | 38 | 2 | 
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| Zacher_Lech_2017_Obstacles_to_Sustainability.pdf | 298 |