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[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, One method of heating in a hothouse, in A Practical Treatise on the Construction, Heating, and Ventilation of Hothouses (1850), p. 199, fig. 39. Library of Congress, Washington, D.C.
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