"Fig. 40. Veneer-over-concrete construction: (a) Uxmal, East Building, Nunnery Quadrangle".
Scanned from George F. Andrews, Pyramids and Palace, Monsters and Masks; Vol. 1, Architecture of the Puuc Regions and the Northern Plains Area, 1995, p. 337.  Reproduced with permission of Labyrinthos, publishers.