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Espy's patent conical ventilator. [Description of] James P. Espy. Washington 1842.

Espy's patent conical ventilator. [Description of] James P. Espy. Wash...

Available also through the Library of Congress web site in two forms: as facsimile page images and as full text in SGML. Printed Ephemera Collection; Portfolio 197, Folder 17.