00318cam a2200145ua 45000010005000000080039000050400009000440410012000530820012000651000019000772450024000962600024001203000009001446530019001538008160509n        II  |||gr||||Z||||||eng  aMAIN  aEnglish  a550 STE  aSTEERS , J.A .  aTHE UNSTABLE EARTH   a[s.l:bs.n.]c1983.  a345.  aEarth sciences