This series contains large size material associated with the illustrations of Mr. Richard Leacroft.
They are typically working drawings and final version of the isometric reconstructions also known as 'cut-away' or 'cut-open' illustrations. These drawings were created in pencil or ink on tracing paper or tracing plastic. There are also a number of sketches and rough drawings. In addition, it contains architectural surveys or research material which were consulted to aid Mr. Leacroft to create his illustrations.