{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Wrought Iron Bridges & Roofs: Lectures Delivered at the Royal Engineer Establishment, Chatham. with Examples of the Calculation of Stress in Girders & Roof Trusses by Graphic & Algebraic Methods","author_name":"William Cawthorne Unwin","thumbnail_url":"https://www.ebooknetworking.net/books/114/625/big1146251548.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-1146251548.html\">Wrought Iron Bridges &amp; Roofs: Lectures Delivered at the Royal Engineer Establishment, Chatham. with Examples of the Calculation of Stress in Girders &amp; Roof Trusses by Graphic &amp; Algebraic Methods</a>","width":400,"height":300}