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Changing conceptions of sustained-yield policy on the national forests


, : Changing conceptions of sustained-yield policy on the national forests. Journal of Forestry 81(3): 150-154

A discussion of changes in definition as used by the USDA Forest Service over the last 75 yr. The most restricted interpretation, that of a non-declining harvest, was adopted in 1973 and reflected in the National Forest Management Act of 1976. It is argued that the policy should be re-examined because of the lack of evidence that non-declining even flow ensures either stable communities or forest resource protection.

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Delgado, G.; Estañol, B.; Rodríguez-Violante, M.; Martínez-Memije, Rúl.; Infante-Vázquez, Óscar.; Bertado-Ramírez, N., 2015: Cardiovascular variability in Mexican patients with Parkinson's disease. Cardiovascular variability (CVV) has been evaluated in patients with Parkinson's disease (PD) in other countries and exhibit ethnic differences. We investigated heart rate variability (HRV) and blood pressure variability (BPV) in Mexican pati...

Rivas Sanchez B.; Monroy Ostria A., 1991: Behavior in mice of a leishmania mexicana strain isolated from case of diffuse cutaneous leishmaniasis. BALB/c and C57BL/6 strains of mice, were inoculated with several doses of promastigotes of a Leishmania mexicana mexicana strain isolated from a DCL patient. The C57BL/6 developed a localized lesion which selfhealed. BALB/c never controlled the in...

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