LANGLEY, Batty and Thomas. Gothic Architecture Improved by Rules and Proportions, London: Printed for I. and J. Taylor, [?1790]. 4° (298 x 224mm). Engraved title and 64 plates (some worming in the upper and lower margins at the beginning just touches engraved area of a few plates, some foxing and staining). Contemporary tree sheep (rebacked). Archer 172.3; Harris 411; RIBA 1728.