00349nam a2200109 a 450000500170000000800410001704100080005810000420006624500650010826400550017330000110022820260716125021.0260701s1976    ii            000 0 eng d  aeng1 aThe Mitchell Beazley Joy of Knowledge14aThe physical earth /cThe Mitchell Beazley Joy of Knowledge. 1aLondan :bMitchell Beazley Encyclopaeedias,c1976.  a264 p.