The Internet Archive has a preservation copy of this work in our general collections. The file type is application/pdf.
application/pdf
Additional access options for the primary version of this work: Archive [Microfilm]
Raymond Pearl, Sylvia L. Parker. "Experimental Studies on the Duration of Life. IV. Data on the Influence of Density of Population on Duration of Life in Drosophila." American Naturalist 56.645 (1922) 312-321