00463nam a2200133Ia 4500008004100000082001400041100001900055245013000074260003800204300000800242650001800250650004200268653001900310170901s1975    xx            000 0 und d  a550bR98C  aRyabchikov, A. 0aChanging Face of the EarthbThe Structure and Dynamics of the Geosphere,Its Natural Development and the Changes caused by Man  aMoscowbProgress Publishersc1975  a205  aPure Sciences  aScience of the earth and other worlds  aEarth sciences