Portuguese Fertility Survey, 1979-80 Conditions of Release Data may be used for academic research, provided that credit is given in any publication resulting from the research to the institute that conducted the survey and that two copies of any publication are sent to the institute: Dr. Gra‡a Costa Central Bureau of Statistics Avenida Antonio Jose de Almeida Lisbon Portugal If you have questions or comments about the data, send e-mail to: wfs@dhsprogram.com