000 00264nam a22001097a 4500
082 _a388.312
_bALE
_cD
245 _aPositive guidance in traffic control
260 _aWashington
_bThe world bank
_c1975
300 _a56 p. :
_bill, ;
_c18 cm.
650 _aD
942 _cBK
999 _c3435
_d3435