Betz,Frederick,Jr. <br/><br/>
Environment geology 

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 - Pennsylvania - EEUU  Hutchinson and Ross  1975 
 - 390p.  25cm 
 - Benchmark papers in geology   v.25 .
<br/><br/><label>ISBN: </label>
<br/><br/><label>Subjects--Topical Terms: </label>--Geologia ambiental--Geomorfologia--Topografia del globo--<br/>Geologia