{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"THREE PUBLIC LECTUERS ON SCIENTIFIC SUBJECTS: I. A MATHEMATICAL APPROACH TO ETHICS; II. THE PRINCIPLE OF SUFFICIENT REASON; III. RECTILINEAR DRAWING","author_name":"George David (prof of Mathematics at Harvard) Birkhoff","thumbnail_url":"https://www.ebooknetworking.net/books/noimage.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B004VJIHR4.html\">THREE PUBLIC LECTUERS ON SCIENTIFIC SUBJECTS: I. A MATHEMATICAL APPROACH TO ETHICS; II. THE PRINCIPLE OF SUFFICIENT REASON; III. RECTILINEAR DRAWING</a>","width":400,"height":300}