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| Area cleared to level of street. The West Branch of the Great Drain in right foreground ... AMS south 3087 Horizontal (normal) ... 3 May 1954 |
| Hydraulic Unknown Limestone (Polygonal Masonry) Good, long stretches preserved ... Ca. 500 B.C. |
| Mixed ... H.Α. Thompson D. Burr-Thompson ... 2939 3128 ... 1951, 1954 |
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