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The compleat surveyor: containing the whole art of surveying of land, by a new instrument lately invented; as also by the plain table, circumferentor, the theodolite as now improv'd, or by the chain only / Containing plain and easy directions in several kinds of mensurations, and other things necessary ... in a work of this nature. By William Leybourn. The whole altered and amended, and two entire books added by the author. Public Domain Mark. Source: Wellcome Collection.