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| Great Drain west of the Eponymous Heroes. Isometric drawing ... W.B. Dinsmoor, Jr ... PD 2286 Horizontal (normal) ... 1974 |
| Cutting for the Great Drain, after clearing, before laying pipe ... south 2172 Horizontal (normal) ... 23 November 1953 |
| Cutting for the Great Drain, after clearing, before laying pipe ... north 2173 Horizontal (normal) ... 23 November 1953 |
| The Great Drain just to the south of the railroad wall ... south 2191 Horizontal (normal) ... 8 March 1955 |
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