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MEMOIR

OF THE

1663J-

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

GENERAL

LIBR

University
MICHIGAN

OF THE ORDNANCE SURVEY OF GREAT BRITAIN

AND IRELAND;

A WORK WITH WHICH GENERAL COLBY WAS CONNECTED FOR
FORTY-FIVE YEARS.

ли

BY

LIEUTENANT-COLONEL J. E/PORTLOCK,

R.E., F.R.G.S. & M.B.I.A., ETC.

SEELEY, JACKSON, & HALLIDAY, 54, FLEET STREET.
LONDON, MDCCCLXIX.

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Soldiers employed on the Survey. Comparison of

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