{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Wages and Labor Markets in the United States, 1820-1860 (National Bureau of Economic Research Series on Long-Term Factors in Economic Dev)","author_name":"Robert A. Margo","thumbnail_url":"https://www.ebooknetworking.net/books/022/650/big0226505073.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-0226505073.html\">Wages and Labor Markets in the United States, 1820-1860 (National Bureau of Economic Research Series on Long-Term Factors in Economic Dev)</a>","width":400,"height":300}