Changes in grass basal area and forb densities over a 64-year period on grassland types of the Jornada Experimental Range. Gibbens, R. P. & Beck, R. F. Journal of Range Management, 1988.
Changes in grass basal area and forb densities over a 64-year period on grassland types of the Jornada Experimental Range [pdf]Paper  bibtex   

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