000 00308nam a2200121Ia 4500
008 190711s9999 xx 000 0 und d
082 _a621.3819535 B658
100 _aBLUM.M.L
245 0 _aDATA GATHERING EXPERIMENTAL METHODS PLUS
260 _aNEW YORK
_bHarper
_c1986
300 _a23X16
942 _cBK
_2DDC
999 _c20742
_d20742