Ordnance Survey.
Argyllshire, 1900: nos. 21 22, 36, 37, 38, 49, 50, 50A, 51, 63 & 64, 66, 78, 80 [2 copies], 93, 95 -- Inverness-shire, 1905: no.10 -- Orkney, 1903: no. 119, 120.