Notes: | "United Nations publication sales no. E.02. XIII.3"--Title page verso. "ST/ESA/SER. A/207." Includes bibliographical references (pages 35-37). Restrictions unspecified Electronic reproduction. [S.l.] : HathiTrust Digital Library, 2010. Master and use copy. Digital master created according to Benchmark for Faithful Digital Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002. http://purl.oclc.org/DLF/benchrepro0212 Summaries in Arabic, Chinese, French, Russian, and Spanish. digitized 2010 HathiTrust Digital Library committed to preserve Print version record.
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