1. World population : an analysis of vital data Author/Creator: Keyfitz, Nathan, 1913-2010 Publication/Creation: Chicago : University of Chicago Press, [1968] Resource Type: Book Access & Availability: Loading
2. World population growth and aging : demographic trends in the late twentieth century Author/Creator: Keyfitz, Nathan, 1913-2010 Publication/Creation: Chicago : University of Chicago Press, 1990 Resource Type: Book Access & Availability: Loading