{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Sex ratios and age ratios in North American ducks (Illinois. Natural History Survey Division. Bulletin)","author_name":"Frank Chapman Bellrose","thumbnail_url":"https://www.ebooknetworking.net/books/B00/07E/bigB0007EWTHG.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B0007EWTHG.html\">Sex ratios and age ratios in North American ducks (Illinois. Natural History Survey Division. Bulletin)</a>","width":400,"height":300}