[111] Crawford (1912) 1. 194, where the literature on the subject is summarised.
[112] Armstrong (1920).
[113] Crawford (1912) 1. 195, 196, with map (fig. 8).
[114] Crawford (1912) 2. 42.
[115] cf. inter alia M.A.N. (1908–9) 5, fig. 1, 11, fig. 5.
[116] Crawford (1912) 1. 186, fig. 2.
[117] Peake (1922) 2.
[118] Clark (1911).
[119] Peake (1911).
[120] Crawford (1912) 1. 196.