00999cam a2200253u  4500003000400000005001700004008004100021040002800062050001500090100003900105245005900144250004000203264004300243300007400286336002600360337002800386338002700414504002000441650001500461650001400476942006900490999001500559952017100574GSU20260505092140.0830613s1920    enkabf        000 0 eng    aDLCcGSUdGSUbengerda00aTA545bTHR1 aThrelfall, Harold Spencer.eauthor02aA text-book on surveying and levelling /cH. Threlfall  aThird editionbrevised and enlarged 4aLondon :bC. Griffin & Company,c1920.  axix, 689 pages :billustrations, folded plates, folded maps ;c20 cm.  atextbtxt2rdacontent  aunmediatedbn2rdamedia  avolumebnc2rdacarrier  aIncludes index. 0aSurveying. 0aLeveling.  2lcccBKeThird edition, revised and enlargedhTA545 kTAmTHRn0  c2620d2620  00102lcc40708RRaGSULEbGSULEcGENd2026-04-20eDonation from Mr Mahwehwe and Dr Makwatii05474l0oTA545 THRp50000006710r2026-04-20 10:57:00t1w2026-04-20yBK