{"title":"20世纪60年代,美国婚姻生育率急剧下降,因为意外和不合时宜的生育减少了50%。","authors":"","doi":"","DOIUrl":null,"url":null,"abstract":"","PeriodicalId":76914,"journal":{"name":"International family planning digest","volume":"2 2","pages":"15-16"},"PeriodicalIF":0.0000,"publicationDate":"1976-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Sharp drop in U.S. marital fertility in 1960s due to 50 percent reduction in unwanted, mistimed births.\",\"authors\":\"\",\"doi\":\"\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"\",\"PeriodicalId\":76914,\"journal\":{\"name\":\"International family planning digest\",\"volume\":\"2 2\",\"pages\":\"15-16\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1976-06-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International family planning digest\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International family planning digest","FirstCategoryId":"1085","ListUrlMain":"","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}