00796nam a22002177a 450000500170000000800410001702000120005804000090007004100080007908200150008710000320010224500830013425000310021726000890024830000470033750000790038450000360046350500350049965000240053470000200055820190213130032.0190213b        xxu||||| |||| 00| 0 eng d  c<$3.50>  aMAIN  aeng00a549.1bWIN1 aWinchell, Alexander Newton,10aElements of optical mineralogy :ban introduction to microscopic petrography /  a4th ed., rev. and enl. ...  aNew York,bJ. Wiley & sons, inc.;aLondon,bChapman & Hall, limited,c1931-<1951   >  av. <2   >billus., tables, diagrs.c24 cm.  aFirst and second editions by Newton H. Winchell and Alexander N. Winchell.  aFour folded diagrams in pocket.1 apt. I. Principles and methods. 0aOptical mineralogy.1 aWinchell, N. H.