12 13 Pg. 13, Trench [6-7 X-V], 24/3/1931, Drawing, Plan Pg. 13, Trench [6-7 X-V], 24/3/1931, Drawing, East side Pg. 13, Trench [6-7 X-V], 24/3/1931, Drawing, West side Pg. 13, Trench [6-7 X-V], 24/3/1931, ... 24/3/1931, 25/3/1931 ... Pg. 13, Trench [6-7 X-V], 24/3/1931, Drawing, Plan ... Pg. 13, Trench [6-7 X-V], 24/3/1931, Drawing, East side ... Pg. 13, Trench [6-7 X-V], 24/3/1931, Drawing, West side
