Plan of the environs of the Klepsydra ... Piet de Jong ... PD 2594 as XVI-48 but less blurry so we keep this one.
See also Ptg. 248. Horizontal (normal) ... 1939
Restored plan of the Klepsydra and its environ ... Piet de Jong ... PD 2594 Cf. see HAT SLIDE 58-273
See also Ptg. 248. 2178 Horizontal (normal) ... April 1939