- Threatened ecosystems
- found: Work cat.: 95008499: Ackerman, D. The rarest of the rare, 1995: p. 18 (endangered ecosystems)
- found: LC database, March 21, 1995 (endangered ecosystems)
- found: Random House (endangered ... 2. threatened with extinction)
- found: Cumberland Plain shale woodlands and shale-gravel transition forest, ©2010: t.p. (nationally threatened ecological community) p. 3 (threatened ecological communities)
- found: The tropical deciduous forest of Alamos : biodiversity of a threatened ecosystem in Mexico, c2000.
- notfound: Web. 3;Dict. ecology & environment;Biol. & agr. index
- 1995-03-22: new
- 2012-02-09: revised
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