Great Drain to South ... ΝΝ-9 1687, 1688 Section ΝΝ 254 ... 19 May 1939
Great Drain; Marble Block in East Wall ... ΝΝ-19 3619, 3620 ΝΝ 2217 A 1129 Section ΝΝ 611 Section ΝΝ 253 Section ΝΝ 252 Section ΝΝ 254 ... 25 Jun 1946