00776cam a2200217 a 4500001000800000005001700008007001400025008004100039019002100080035001700101035001200118035001200130040002600142100005500168245007300223260005800296300003600354504005100390533010400441650001300545237741220080822110513.0hg aoc---bucu851113s1851 enka cb 001 0 eng d1 a4235440z4235440 9000004235440 92302456 a2377412 aOCLCbengcOCLCdOCLC1 aDe La Beche, Henry T.q(Henry Thomas),d1796-1855.14aThe geological observerh[microform] /cby Sir Henry T. De La Beche. aLondon :bLongman, Brown, Green, and Longmans,c1851. axxxii, 846 p. :bill. ;c22 cm. aIncludes bibliographical references and index. aMicro-opaque.bNew York :cReadex Microprint,d1969.e9 cards ; 23 x 15 cm.f(Landmarks of science) 0aGeology.