{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Hours of work as related to output and health of workers: metal manufacturing industries [1897]","author_name":"National Industrial Conference Board","thumbnail_url":"https://www.ebooknetworking.net/books/142/977/big1429774851.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-1429774851.html\">Hours of work as related to output and health of workers: metal manufacturing industries [1897]</a>","width":400,"height":300}