This report contains the proceedings of the Fourth National Conference on Population/Family Planning Library and Information Services held in Chapel Hill, North Carolina, May 6-7, 1971. Under the joint sponsorship of the Carolina Population Center and the U.S. Agency for International Development, this was the fourth in a series of annual conference/workshops devoted to library and information needs and services in the population/family planning field. Part One has a summary report, list of participants, and conference agenda. Part Two reports a four-part panel discussion, "The Partnership of Government and Private Sources of Population/Family Planning Information," dealing with interrelationships of public and private contributions to a population/family planning information network. Part Three covers the international aspects with presentations on library networks, Asian services consultants, population work and programs, and demographic centers of the United Kingdom, Canada, Latin America, and the Organization for Economic Co-operation and Development. Part Four summarizes a workshop on the data, products, and services of the Bureau of the Census. Reviews of previous conferences, participant statistics, and Constitution of the Association For Population Libraries and Information Centers (APLIC) are included. (AL)