Memoir of the life of Major-General Colby:
R.E., LL.D., F.R.S.L. & E., F.R.A.S., F.G.S., M.R.I.A., etc: together with a sketch of the origin and progress of the ordnance survey of Great Britain and Ireland; a work with which General Colby was connected for forty-five years. /
by Lieutenant-Colonel J.E. Portlock, R.E., F.R.G.S. & M.R.I.A., etc.