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(Archived document, may contain errors) ,874 January 28,1992 GUIDELINES FOR THE U.N ENWR0"TAL CONFERENCE INTRODUCTION The United Nations this March continues its analysis of how national environ mental policies affect economic development. Convening in Manhattan from March 2 to April 3 is the fourth preparatory conference for the U.N. Conference on the Environment and Development (UNCED Unofficially called the "Earth Summit UNCED will meet from June 1 to 12,1992, in Rio de Janeiro.