Tolquhon Castle: survey and plan of ground floor Tolquhon Castle, Aberdeenshire, 'surveyed by D[avid] McG[ibbon] and T[homas] Ross, 1881, revised by W[illiam] D[ouglas] Simpson, 1924, revised again after excavations 1936'. Plan of ground floor and forms of loop holes in turrets at entrance gateway. Scale in feet 1936