000			00350nam a2200157Ia 4500
008			190201s9999 xx 000 0 und d
020			_a9.79E+12
082			_a5
082			_b133 CR
100			_aCrooks Clayton E.-II
245		0	_aLearning Visual basic.Ne
260			_aNew Delhi
260			_bFirewall media
260			_c2007
300			_a439
999			_c47361 _d47361