000			00314nam a2200145Ia 4500
008			131111s9999 xx 000 0 und d
100			_aBurton,R
245			_aBirds migration
260			_aLondon
260			_bFacts on File
260			_c1992
300			_a160p.
650			_aZoology _aBirds
763			_a21319
999			_c31092 _d31092