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| Pencil drawings with measurements of part of the Great Drain ... No 2 Folder I. Eponymous Heroes ... 14 Jun 1968 |
| Pipe from drain of Building F ... John Travlos ... XVII-3 XVII-3 Dirty Cartridge Paper Drafting Ink ... 1936 |
| Collecting basin and drain; plan and section ... J.T.? ... HSR group K. |
| Plan and section of east branch of Great Drain; unfinished ... John Travlos ... Possibly section Λ? Dirty Cartridge Paper Drafting Ink |
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