The Delft University of Technology Library, the oldest technical library in the Netherlands, is the national focal point for collecting literature on the applied sciences and technology. A major part of this collection covers applied and visual arts, with works from the sixteenth and seventeenth century based on Vitruvius, others by Palladio, Serlio or Dutch architects like Hendrik de Keyser, and contextual material on architecture and the fine arts. The Treasury aims to be both a nationally and an internationally known collection of technological literature.