File:1652.jpg
[http://www.nga.gov/content/ngaweb/research/casva/research-projects.html A Project of the National Gallery of Art, Center for Advanced Study in the Visual Arts ]
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Robert B. Leuchars, The zig-zag or ridge-and-furrow roof, in A Practical Treatise on the Construction, Heating, and Ventilation of Hothouses (1850), 65, fig. 21. Library of Congress, Washington, D.C.
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| current | 21:08, April 14, 2016 | | 800 × 1,200 (209 KB) | C-tompkins (talk | contribs) |
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