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APCA Working Paper Series Submit your working paper now The Centers The Association of Population Centers APC founded in 1991 is an independent group of universities and research groups whose mission is to The APC is open to any organization with a primary interest in population research and training. POPULATION What We Do members Our members are over 40 academic and private research institutions nationwide. Centers rely on a number of public and private funding sources to support their scientists research. Events Stay up to date with our calendar of events seminars webinars and conference.