000 00282nam a2200121Ia 4500
008 160710s1975 xx 000 0 und d
082 _a301.36 HEL
100 _aHELLY ,WALTER
245 _aURBAN SYSTEMS MODELS
260 _bACADEMIC PRESS
_c1975
300 _a185
942 _2ddc
_cB
999 _c37396
_d37396