Plate 51 



Upper: \^entilators in the second and third (left) unnumbered rooms east of 297 were extended 

 through the abutting fourth-type stonework to the exterior. 



Lozver: In their final addition the Late Bonitians provided a long repository above each 



ventilator as it reached to the exterior from the outer row of third-type rooms. 



(Photographs by O. C. Havens. 1923.) 



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