[Étienne LE GRAND (? -1751), Antoine DESGODETS], Traité du toisé des bastimens aux us et coutusmes de Paris, expliqué en l'Académie royale d'architecture par M. Desgodets, architecte du roi, circa 1725 1 vol. in-folio: title and 200 carefully calligraphed numbered pages, including table of contents. Copy without illustrations. Staining requiring restoration of title page and most affected leaves. Rebound in identical green vellum. Original monogram "LG" mounted on upper board. A much larger copy of Desgodets' traité du toisé than the 14 other copies identified in 2022, and the only one to date whose author can be named. Desgodets' treatise has been a key reference for the transmission of quantity surveying skills, one of the pillars of the architectural profession. Now the job of quantity surveyors, the quantity surveyor's work consisted in checking the quantities (volumes by weight) of materials used by the contractor in his work, and thereby validating his invoice. At the time, quotations were based on unit prices, and final payment was directly proportional to the quantities used on site. The quantity surveyor's job therefore required good geometric and economic knowledge, as well as a thorough understanding of architecture to validate the work.