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| Utgitt
| New York : United Nations , 1976
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| Omfang
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| Opplysninger
| "... prepared on the basis of a seminar held by a group of experts at the University of Puerto Rico, Rio Piedras campus, from 9 to 13 December 1974 ..." - Forordet. - "ST/ESA/51.". - Over tittelen: Department of Economic and Social Affairs
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| Emner
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