25th anniversary: The Sierra Gorda Biosphere
History · Anniversaries · Thu, May 19, 2022
1997: The Sierra Gorda Biosphere, which encompasses the most ecologically diverse region in Mexico, was established as a result of grassroots efforts.
Source, method and history
- Source
- Wikipedia
- How we know
- Wikipedia "On this day" selected anniversary, 25 years (1997 to 2022).
- Recurs
- annual
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- Changes
- 2026-09-25: added to 2022-05-19