{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"The Evolution of Retirement: An American Economic History, 1880-1990 (National Bureau of Economic Research Series on Long-Term Factors in Economic Dev)","author_name":"Dora L. Costa","thumbnail_url":"https://www.ebooknetworking.net/books/022/611/big0226116085.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-0226116085.html\">The Evolution of Retirement: An American Economic History, 1880-1990 (National Bureau of Economic Research Series on Long-Term Factors in Economic Dev)</a>","width":400,"height":300}