000			00342nam a2200145Ia 4500
008			240201s1973 xx 000 0 eng d
020			_a356040488
082			_a032 BW.1
100			_aSWALLOW SU
245		0	_aOUR EARTH - BEGINNER'S WORLD 1
260			_bMACDONALD AND COMPANY _c1973
300			_a28
650			_aSCIENCE
942			_2ddc _cBK
999			_c3798 _d3798