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| The West Branch of the Great Drain in its early and late courses ... southwest Horizontal (normal) ... June 1938 |
| Middle drain to north of Building C before final clearing. West Branch of the Great Drain showing its two courses ... Publication says from the northeast. southwest 2564 Horizontal (normal) ... 21 May 1938 |
| Middle drain to north of Building C, as cleared ... north 2567 Horizontal (normal) ... 31 May 1938 |
| Middle drain to north of Building C, as cleared ... south 2566 Horizontal (normal) ... 31 May 1938 |
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